All Wiring Diagrams for GMC Forward Control P1996 3500 model

AIR CONDITIONING

4.3L

4.3L (VIN W), A/C Wiring Diagram for GMC Forward Control P1996 3500

List of elements for 4.3L (VIN W), A/C Wiring Diagram for GMC Forward Control P1996 3500:

• (provisions for body builder hvac system)
• A/c compressor clutch
• A/c compressor clutch relay (engine bulkhead relay bracket)
• A/c compressor high pressure cutoff switch (rear of compressor)
• A/c compressor refrigerant pressure switch (rear of compressor)
• A/c enable
• A/c request
• Diode
• Eng-bat fuse 15a
• G112 (rear of left cylinder head)
• G200 (left interior bulkhead)
• Gauges fuse 20a
• Hot at all times
• Hot in run or start
• I/p fuse box
• Pnk
• R100 (engine harness, 30 cm from break-out to maf
• Sensor)
• Vehicle control module (left radiator support)

Heater Wiring Diagram for GMC Forward Control P1996 3500

List of elements for Heater Wiring Diagram for GMC Forward Control P1996 3500:

• Blower motor
• Blower resistor (engine compartment, on blower housing)
• Fuse block
• Heater blower switch
• Hot in run
• Htr a/c fuse 20a
• Med
• Off

5.7L

5.7L (VIN R), A/C Wiring Diagram for GMC Forward Control P1996 3500

List of elements for 5.7L (VIN R), A/C Wiring Diagram for GMC Forward Control P1996 3500:

• (provisions for body builder hvac system)
• A/c compressor clutch
• A/c compressor clutch relay (engine bulkhead relay bracket)
• A/c compressor high pressure cutoff switch (rear of compressor)
• A/c compressor refrigerant pressure switch (rear of compressor)
• A/c enable
• A/c request
• Diode
• Eng-bat fuse 15a
• G112 (rear of left cylinder head)
• G200 (left interior bulkhead)
• Gauges fuse 20a
• Hot at all times
• Hot in run or start
• I/p fuse box
• Pnk
• R100 (engine harness, 30 cm from break-out to maf
• Sensor)
• Vehicle control module (left radiator support)

Heater Wiring Diagram for GMC Forward Control P1996 3500

List of elements for Heater Wiring Diagram for GMC Forward Control P1996 3500:

• Blower motor
• Blower resistor (engine compartment, on blower housing)
• Fuse block
• Heater blower switch
• Hot in run
• Htr a/c fuse 20a
• Med
• Off

6.5L

6.5L (VIN F), A/C Wiring Diagram for GMC Forward Control P1996 3500

List of elements for 6.5L (VIN F), A/C Wiring Diagram for GMC Forward Control P1996 3500:

• (4 cm from break- out for aux cooling fan) r100
• (left interior
• (left radiator support) powertrain control module (left side of driver's island)
• (provisions for body builder hvac system)
• (rear of left cylinder head) g112
• (vin f)
• (vin j)
• A/c enable
• A/c request
• A/c compressor clutch
• A/c compressor clutch relay (engine bulkhead relay bracket)
• A/c compressor high pressure cutoff switch (rear of compressor)
• A/c compressor refrigerant pressure switch (rear of compressor)
• Auxiliary engine coolant fan
• Auxiliary engine coolant fan a/c pressure switch (in a/c high pressure line)
• Auxiliary engine coolant fan relay (engine bulkhead relay bracket)
• Auxiliary fan control switch (on right side of cylinder head)
• Bulkhead)
• C2 c3
• C3 c1
• Diode
• Eng 1 fuse 20a
• Eng-bat fuse 15a
• G200
• G200 (left interior bulkhead)
• Gauges fuse 20a
• Hot at all times
• Hot in run
• Hot in run or start
• I/p fuse box
• Pnk
• Red
• Vehicle control module
• Vin j vin f

6.5L (VIN Y), A/C Wiring Diagram for GMC Forward Control P1996 3500

List of elements for 6.5L (VIN Y), A/C Wiring Diagram for GMC Forward Control P1996 3500:

• (6.5l vin y)
• (7.4l vin n)
• (provisions for body builder hvac system)
• A/c compressor clutch
• A/c compressor clutch relay (engine bulkhead relay bracket)
• A/c compressor high pressure cutoff switch (rear of compressor)
• A/c compressor refrigerant pressure switch (rear of compressor)
• Auxiliary engine coolant fan
• Auxiliary engine coolant fan a/c pressure switch (in a/c high pressure line)
• Auxiliary engine coolant fan relay (engine bulkhead relay bracket)
• Auxiliary fan control switch (right side of cylinder head)
• Diode
• Eng 1 fuse 20a
• Eng-bat fuse 15a
• G200 (left interior bulkhead)
• Hot at all times
• Hot in run
• I/p fuse box
• Pnk
• Red
• Vin n only

Heater Wiring Diagram for GMC Forward Control P1996 3500

List of elements for Heater Wiring Diagram for GMC Forward Control P1996 3500:

• Blower motor
• Blower resistor (engine compartment, on blower housing)
• Fuse block
• Heater blower switch
• Hot in run
• Htr a/c fuse 20a
• Med
• Off

7.4L

7.4L (VIN J), A/C Wiring Diagram for GMC Forward Control P1996 3500

List of elements for 7.4L (VIN J), A/C Wiring Diagram for GMC Forward Control P1996 3500:

• (4 cm from break- out for aux cooling fan) r100
• (left interior
• (left radiator support) powertrain control module (left side of driver's island)
• (provisions for body builder hvac system)
• (rear of left cylinder head) g112
• (vin f)
• (vin j)
• A/c enable
• A/c request
• A/c compressor clutch
• A/c compressor clutch relay (engine bulkhead relay bracket)
• A/c compressor high pressure cutoff switch (rear of compressor)
• A/c compressor refrigerant pressure switch (rear of compressor)
• Auxiliary engine coolant fan
• Auxiliary engine coolant fan a/c pressure switch (in a/c high pressure line)
• Auxiliary engine coolant fan relay (engine bulkhead relay bracket)
• Auxiliary fan control switch (on right side of cylinder head)
• Bulkhead)
• C2 c3
• C3 c1
• Diode
• Eng 1 fuse 20a
• Eng-bat fuse 15a
• G200
• G200 (left interior bulkhead)
• Gauges fuse 20a
• Hot at all times
• Hot in run
• Hot in run or start
• I/p fuse box
• Pnk
• Red
• Vehicle control module
• Vin j vin f

7.4L (VIN N), A/C Wiring Diagram for GMC Forward Control P1996 3500

List of elements for 7.4L (VIN N), A/C Wiring Diagram for GMC Forward Control P1996 3500:

• (6.5l vin y)
• (7.4l vin n)
• (provisions for body builder hvac system)
• A/c compressor clutch
• A/c compressor clutch relay (engine bulkhead relay bracket)
• A/c compressor high pressure cutoff switch (rear of compressor)
• A/c compressor refrigerant pressure switch (rear of compressor)
• Auxiliary engine coolant fan
• Auxiliary engine coolant fan a/c pressure switch (in a/c high pressure line)
• Auxiliary engine coolant fan relay (engine bulkhead relay bracket)
• Auxiliary fan control switch (right side of cylinder head)
• Diode
• Eng 1 fuse 20a
• Eng-bat fuse 15a
• G200 (left interior bulkhead)
• Hot at all times
• Hot in run
• I/p fuse box
• Pnk
• Red
• Vin n only

Heater Wiring Diagram for GMC Forward Control P1996 3500

List of elements for Heater Wiring Diagram for GMC Forward Control P1996 3500:

• Blower motor
• Blower resistor (engine compartment, on blower housing)
• Fuse block
• Heater blower switch
• Hot in run
• Htr a/c fuse 20a
• Med
• Off

COMPUTER DATA LINES

Computer Data Lines, Commercial Chassis for GMC Forward Control P1996 3500

List of elements for Computer Data Lines, Commercial Chassis for GMC Forward Control P1996 3500:

• (a/t) g114 (on rear of left cylinder head)
• B10
• Data clss 2
• Data link connector (left side of interior bulkhead, on right side of relay bracket)
• Diag enable
• Diesel
• Eng bat fuse 15a
• G119 (m/t) (alternator bracket)
• G131 (thermostat housing)
• G202 (left side of interior bulkhead)
• Gasoline
• Hot at all times
• I/p fuse block
• Tan
• Transmission control module (diesel a/t only) (left interior bulkhead, on top of relay bracket)
• Uart data
• Vehicle control module (gasoline only) (left radiator support)

Computer Data Lines, Motor Home Chassis for GMC Forward Control P1996 3500

List of elements for Computer Data Lines, Motor Home Chassis for GMC Forward Control P1996 3500:

• 7.4l vin j & 6.5l vin f only
• A14
• Data clss 2
• Data link connector (left side support bracket of steering column)
• Diag enable
• Diesel
• Eng bat fuse 15a
• G112 (20 cm from left glow plug harness breakout)
• G120 (10 cm from alternator harness breakout)
• G202 (20 cm from i/p breakout)
• Gasoline
• Hot at all times
• I/p fuse block
• Powertrain control module (6.5l vin f only) (left side of driver's island)
• Powertrain control module (7.4l vin n only) (left side of driver's island)
• Tan
• Uart data
• Vehicle control module (7.4l vin j only) (top of radiator support)

COOLING FAN

6.5L

6.5L (VIN F), Cooling Fan Wiring Diagram for GMC Forward Control P1996 3500

List of elements for 6.5L (VIN F), Cooling Fan Wiring Diagram for GMC Forward Control P1996 3500:

• Auxiliary engine coolant fan
• Auxiliary engine coolant fan a/c pressure switch (in a/c high pressure line)
• Auxiliary engine coolant fan relay (engine bulkhead relay bracket, under battery junction block)
• Auxiliary fan control switch (on right side of cylinder head)
• Eng 1 fuse 20a
• G200 (left interior bulkhead)
• Hot at all times
• Hot in run
• I/p fuse box
• Pnk
• Red
• Vins j, n & f only

6.5L (VIN Y), Cooling Fan Wiring Diagram for GMC Forward Control P1996 3500

List of elements for 6.5L (VIN Y), Cooling Fan Wiring Diagram for GMC Forward Control P1996 3500:

• Auxiliary engine coolant fan
• Auxiliary engine coolant fan a/c pressure switch (in a/c high pressure line)
• Auxiliary engine coolant fan relay (engine bulkhead relay bracket, under battery junction block)
• Auxiliary fan control switch (on right side of cylinder head)
• Eng 1 fuse 20a
• G200 (left interior bulkhead)
• Hot at all times
• Hot in run
• I/p fuse box
• Pnk
• Red
• Vins j, n & f only

7.4L

7.4L (VIN J), Cooling Fan Wiring Diagram for GMC Forward Control P1996 3500

List of elements for 7.4L (VIN J), Cooling Fan Wiring Diagram for GMC Forward Control P1996 3500:

• Auxiliary engine coolant fan
• Auxiliary engine coolant fan a/c pressure switch (in a/c high pressure line)
• Auxiliary engine coolant fan relay (engine bulkhead relay bracket, under battery junction block)
• Auxiliary fan control switch (on right side of cylinder head)
• Eng 1 fuse 20a
• G200 (left interior bulkhead)
• Hot at all times
• Hot in run
• I/p fuse box
• Pnk
• Red
• Vins j, n & f only

7.4L (VIN N), Cooling Fan Wiring Diagram for GMC Forward Control P1996 3500

List of elements for 7.4L (VIN N), Cooling Fan Wiring Diagram for GMC Forward Control P1996 3500:

• Auxiliary engine coolant fan
• Auxiliary engine coolant fan a/c pressure switch (in a/c high pressure line)
• Auxiliary engine coolant fan relay (engine bulkhead relay bracket, under battery junction block)
• Auxiliary fan control switch (on right side of cylinder head)
• Eng 1 fuse 20a
• G200 (left interior bulkhead)
• Hot at all times
• Hot in run
• I/p fuse box
• Pnk
• Red
• Vins j, n & f only

CRUISE CONTROL

6.5L

6.5L (VIN F), Cruise Control Wiring Diagram, Motor Home Chassis for GMC Forward Control P1996 3500

List of elements for 6.5L (VIN F), Cruise Control Wiring Diagram, Motor Home Chassis for GMC Forward Control P1996 3500:

• (engine harn, 16 cm from bulkhead grommet)
• (i/p harness, 8 cm from breakout for steering column)
• A11
• B10
• B11
• Cruise on input
• D10
• Disengage input
• Hazard lamps flasher
• Hot at all times
• Hot in run
• I-3 fuse 9 15a
• I/p fuse block
• Multifunction lever
• Nca
• Off
• Powertrain control module (pcm) (left side of driver's island)
• R/a
• Resume/accel input
• S/c
• S116
• S124
• S200
• Set/coast input
• Stop/haz fuse 11 15a
• Stoplamp switch (top of brake pedal)
• Torque converter clutch and stoplamps switch (right side of steering column upper support)
• Vehicle speed sensor buffer (above accelerator pedal)
• Vss hi
• Vss lo

7.4L

7.4L (VIN J), Cruise Control Wiring Diagram, Motor Home Chassis for GMC Forward Control P1996 3500

List of elements for 7.4L (VIN J), Cruise Control Wiring Diagram, Motor Home Chassis for GMC Forward Control P1996 3500:

• (engine harn, 11 cm from breakout to cruise module)
• (engine harn, 45 cm from breakout for map sensor)
• (rear of transmission)
• 4000 pulses/mile
• Cruise control module (radiator support bracket)
• Cruise control switch
• Cruise on input
• Cruise status
• Disengage input
• Ground
• Hazard lamps flasher
• Hot at all times
• Hot in run
• I-3 fuse 9 15a
• I/p fuse block
• Ignition
• Nca
• Off
• R/a
• Resume/accel input
• S/c
• S116
• S124
• S126
• S200
• Set/coast input
• Stop/haz fuse 11 15a
• Stoplamp switch (top of brake pedal)
• Torque converter clutch and stoplamps switch (right side of steering column upper support)
• Vehicle control module (vcm) (top of radiator support)
• Vehicle speed input
• Vehicle speed sensor (vss)
• Vss return
• Vss signal

7.4L (VIN N), Cruise Control Wiring Diagram, Motor Home Chassis for GMC Forward Control P1996 3500

List of elements for 7.4L (VIN N), Cruise Control Wiring Diagram, Motor Home Chassis for GMC Forward Control P1996 3500:

• (engine harn, 4 cm from cruise module breakout)
• (i/p harn, 22 cm from bulkhead grommet)
• 4000 pulses/mile
• Cruise control module (radiator support bracket)
• Cruise control switch
• Cruise on input
• Disengage input
• Ground
• Hazard lamps flasher
• Hot at all times
• Hot in run
• I-3 fuse 15a
• I/p fuse block
• Ignition
• Nca
• Off
• R/a
• Resume/accel input
• S/c
• S116
• S124
• S126
• S200
• Set/coast input
• Stop/haz fuse 15a
• Stoplamp switch (top of brake pedal)
• Torque converter clutch and stoplamps switch (top of brake pedal)
• Vehicle speed input
• Vehicle speed sensor buffer (above accelerator pedal)

ENGINE PERFORMANCE

4.3L

4.3L (VIN W), Engine Performance Wiring Diagrams, Commercial Chassis (1 of 4) for GMC Forward Control P1996 3500

List of elements for 4.3L (VIN W), Engine Performance Wiring Diagrams, Commercial Chassis (1 of 4) for GMC Forward Control P1996 3500:

• 1-2 shift sol ctrl
• 2-3 shift sol ctrl
• 3x ckp sens sig
• A pnk
• A/c cmp cltch rly out
• A/c compressor clutch relay (engine bulkhead relay bracket, under battery junction block)
• Cam posit sens rtn
• Cam posit sens sig
• Camshaft position (cmp) sensor (in distributor)
• Ckp sens rtn
• Crankshaft position (ckp) sensor (right front of engine at crankshaft balancer pulley)
• Ect sensor input
• Egr posit input
• Evap can purge ctrl
• Evaporative emissions (evap) canister purge solenoid valve (right center of intake manifold)
• Feed ign a pnk
• Fuel inj no.1 ctrl
• Fuel inj no.2 ctrl
• Fuel inj no.3 ctrl
• Fuel inj no.4 ctrl
• Fuel inj no.5 ctrl
• Fuel inj no.6 ctrl
• G110 (thermostat housing)
• Hall effect sensor
• Heated oxygen sensor (ho2s) left pre-convertor (left exhaust pipe ahead of catalytic converter)
• Ho2s bnk1 sens1 gnd
• Ho2s bnk1 sens1 sig
• Ho2s bnk2 sens1 gnd
• Ho2s bnk2 sens1 sig
• Ho2s post sens2 gnd
• Ho2s post sens2 sig
• Iat sens sig
• Idle air control (iac) valve (left side of air intake system)
• Idle air ctrl (a-low)
• Idle air ctrl (b-low)
• Idle air ctrl (iac) a-hi
• Idle air ctrl (iac) b-hi
• Knock sens sig
• Knock sensor (ks) (rear of engine, top center)
• Map sensor input
• Mass air flow input
• Nca
• Pnk
• Pnk c
• Pnk d
• Power
• Sens gnd
• Tan
• Tan b
• Tcc pwm sol ctrl
• Tft sig
• Throttle position sens
• Vehicle control module (vcm) (vcm bracket bolted to left radiator support)
• Vehicle speed sensor (vss) (left rear of transmission, near center)
• Vss rtn
• Vss sig
• Wheel speed sensor, left front (left frame rail near radiator)
• Wheel speed sensor, right front (right frame rail near radiator)
• Whl spd rtn, left frt
• Whl spd rtn, right frt
• Whl spd sig, left frt
• Whl spd sig, right frt

4.3L (VIN W), Engine Performance Wiring Diagrams, Commercial Chassis (2 of 4) for GMC Forward Control P1996 3500

List of elements for 4.3L (VIN W), Engine Performance Wiring Diagrams, Commercial Chassis (2 of 4) for GMC Forward Control P1996 3500:

• (front left top of intake manifold) linear exhust gas recirculation (egr) valve
• (rear of left cylinder head) g114
• 1-2 shift solenoid
• 2-3 shift solenoid
• Automatic transmission (a/t) (if equipped) (rear of engine)
• Ecm-1 fuse 20a
• Eng 1 fuse 20a
• Fuel injector no.1
• Fuel injector no.2
• Fuel injector no.3
• Fuel injector no.4
• Fuel injector no.5
• Fuel injector no.6
• Heated oxygen sensor (h02s) post convertor (exhaust pipe behind catalytic converter)
• Heated oxygen sensor (ho2s) right pre-convertor (right exhaust pipe ahead of catalytic converter)
• Hot in (on) run & start (crank)
• I/p fuse block (dash panel provided by body builder) (body builder installed)
• Nca
• Note: (fuel injectors are located in central port injection, central sfi, in center of intake manifold, at fuel meter body)
• Pnk
• Pnk d
• Pnk n
• Pressure control solenoid (pcs)
• Red p
• Tan
• Tan a
• Tcc pwm solenoid
• Trans fuse 10a
• Transmission fluid temperature (tft) sensor (internal)
• Transmission range (tr) pressure switch assembly
• W:a/t only

4.3L (VIN W), Engine Performance Wiring Diagrams, Commercial Chassis (3 of 4) for GMC Forward Control P1996 3500

List of elements for 4.3L (VIN W), Engine Performance Wiring Diagrams, Commercial Chassis (3 of 4) for GMC Forward Control P1996 3500:

• (tail & stop lamps extension harness at crossmember in front of fuel tank) g415
• 5v ref
• A/c compressor high pressure cut-off switch (rear of a/c compressor)
• Eng-bat fuse 15a
• Engine coolant temperature (ect) sensor (front of intake manifold near thermostat housing)
• Fuel gauge
• Fuel pump switch & engine oil pressure gauge sensor (top left rear of engine)
• Fuel sender & fuel pump (top of fuel tank)
• G110 (thermostat housing)
• G114 (rear of left cylinder head)
• G202 (left interior bulkhead near relay bracket) (body builder installed)
• Gauges fuse 20a
• Ground distribution system
• Hot at all times
• Hot in (on) run & start (crank)
• I/p fuse block (dash panel provided by body builder) (body builder installed)
• Instrument cluster
• Intake air temperature (iat) sensor (engine air induction system elbow near remote air cleaner)
• Manifold absolute pressure (map) sensor (intake manifold, rear center)
• Map
• Mass air flow sensor (maf) (air intake system between air cleaner & engine)
• Nca
• Oil press gauge
• Pnk
• R100 (1100 ohms .75 watts)
• Red
• Red 1o
• Ref lo
• Service engine soon indicator
• Speedo meter
• Tan
• Tan a
• Temp
• Throttle position (tp) sensor (intake system, left side)

4.3L (VIN W), Engine Performance Wiring Diagrams, Commercial Chassis (4 of 4) for GMC Forward Control P1996 3500

List of elements for 4.3L (VIN W), Engine Performance Wiring Diagrams, Commercial Chassis (4 of 4) for GMC Forward Control P1996 3500:

• (engine harness, taped to ignition coil breakout)
• (left interior bulkhead near relay bracket) (body builder installed) g202
• (rear of left cylinder head) g114
• (thermo- stat housing) g110
• (thermostat housing) g110
• 5v ref
• 5v return
• 87a
• A/c request sig
• A/t
• A/t input speed sensor (transmission, left front)
• Brake sig
• Brake/transmission shift interlock (btsi) relay (left interior bulkhead on relay bracket)
• Clutch pedal position switch (left side of brake pedal bracket)
• Clutch sig
• Cylinder no.1
• Cylinder no.2
• Cylinder no.3
• Cylinder no.4
• Cylinder no.5
• Cylinder no.6
• Data link connector (dlc) (partial) (left interior bulkhead on right side of relay bracket)
• Distributor (top rear of engine)
• Ecm-bat fuse 20a
• Electronic ignition (ei) coil driver module (bracket at top edge of right cylinder head)
• Feed ignition
• Fuel pump a prime connector (taped to fuel pump relay breakout)
• Fuel pump relay (engine bulkhead relay bracket under battery junction block)
• Fuel pump rly ctrl
• Ground
• High voltage coil wire
• Hot at all times
• Hot in (on) run
• I-3 fuse 15a
• I/p fuse block (dash panel provided by body builder) (body builder installed)
• Ign feed
• Ignition coil (bracket at top edge of right cylinder head)
• Input spd sens rtn
• Input spd sens sig
• M/t
• M/t only
• Mil ctrl
• Pcs sol (hi)
• Pcs sol (lo)
• Pnk
• Pnk a
• Range sig "a"
• Range sig "b"
• Range sig "c"
• Red
• Return control timing
• Serial data
• Service circuit power
• Signal control timing
• Spark plugs
• System ground
• Tachometer (provision for) a
• Timing ctrl sig
• Torque convertor clutch (tcc) & stop lamps switch (right side of steering column upper support)
• Vehicle control module (vcm) (vcm bracket bolted to left radiator support)
• Vss output

5.7L

5.7L (VIN R), Engine Performance Wiring Diagrams, Commercial Chassis (1 of 4) for GMC Forward Control P1996 3500

List of elements for 5.7L (VIN R), Engine Performance Wiring Diagrams, Commercial Chassis (1 of 4) for GMC Forward Control P1996 3500:

• 1-2 shift sol ctrl
• 2-3 shift sol ctrl
• 4x ckp sens sig
• A pnk
• A/c cmp cltch rly out
• A/c compressor clutch relay (engine bulkhead relay bracket, under battery junction block)
• C pnk
• Cam posit sens rtn
• Cam posit sens sig
• Camshaft position (cmp) sensor (in distributor)
• Ckp sens rtn
• Ckp sensor return
• Ckp sensor signal
• Crankshaft position sensor (ckp) (right front of engine at crankshaft balancer pulley)
• Ect sensor in
• Egr posit in
• Evap can purge ctrl
• Evaporative emissions (evap) canister purge solenoid valve (right center of intake manifold)
• Fuel inj no.1 ctrl
• Fuel inj no.2 ctrl
• Fuel inj no.3 ctrl
• Fuel inj no.4 ctrl
• Fuel inj no.5 ctrl
• Fuel inj no.6 ctrl
• Fuel inj no.7 ctrl
• Fuel inj no.8 ctrl
• G110 (thermostat housing)
• Hall effect sensor
• Heated oxygen sensor (ho2s) left pre-convertor (left exhaust pipe ahead of catalytic converter)
• Heated oxygen sensor (ho2s) right pre-convertor (right exhaust pipe ahead of catalytic converter)
• Ho2s bnk1 sens1 gnd
• Ho2s bnk1 sens1 sig
• Ho2s bnk1 sens2 gnd
• Ho2s bnk1 sens2 sig
• Ho2s bnk2 sens1 gnd
• Ho2s bnk2 sens1 sig
• Ho2s bnk2 sens2 gnd
• Ho2s bnk2 sens2 sig
• Iat sens sig
• Idle air control (iac) valve (left side of air intake system)
• Idle air ctrl (a-low)
• Idle air ctrl (b-low)
• Idle air ctrl (iac) a-hi
• Idle air ctrl (iac) b-hi
• Ign feed
• Knock sens sig
• Knock sensor (ks) (engine block, lower right side in front of starter)
• Map sensor in
• Mass air flow in
• Nca
• Pnk
• Pnk d
• Pnk pnk
• Power
• Sens gnd
• Tan
• Tan a
• Tan b
• Tcc pwm sol ctrl
• Tft sig
• Throttle posit sens
• Vehicle control module (vcm) (vcm bracket bolted to left radiator support)
• Vehicle speed sensor (vss) (left rear of transmission, near center)
• Vss rtn
• Vss sig
• Wheel speed sensor, left front (left frame rail near radiator)
• Wheel speed sensor, right front (right frame rail near radiator)
• Whl spd rtn, left frt
• Whl spd rtn, right frt
• Whl spd sig, left frt
• Whl spd sig, right frt

5.7L (VIN R), Engine Performance Wiring Diagrams, Commercial Chassis (2 of 4) for GMC Forward Control P1996 3500

List of elements for 5.7L (VIN R), Engine Performance Wiring Diagrams, Commercial Chassis (2 of 4) for GMC Forward Control P1996 3500:

• (rear of left cylinder head) g114
• 1-2 shift solenoid
• 2-3 shift solenoid
• Automatic transmission (a/t) (if equipped) (rear of engine)
• Ecm-1 fuse 20a
• Eng 1 fuse 20a
• Fuel injector no.1
• Fuel injector no.2
• Fuel injector no.3
• Fuel injector no.4
• Fuel injector no.5
• Fuel injector no.6
• Fuel injector no.7
• Fuel injector no.8
• Heated oxygen sensor (ho2s) left post convertor (left exhaust pipe behind catalytic converter)
• Heated oxygen sensor (ho2s) right post convertor (right exhaust pipe behind catalytic converter)
• Hot in (on) run & start (crank)
• I/p fuse block (dash panel provided by body builder) (body builder installed)
• Linear exhaust gas recirculation (egr) solenoid valve (front left top of intake manifold)
• Nca
• Note: fuel injectors are located in central port injection, center of intake manifold (fuel meter body)
• Pnk
• Pnk d
• Pnk n
• Pnk pnk pnk pnk
• Pressure control solenoid (pcs)
• Red p
• Tan
• Tan a
• Tcc pwm solenoid
• Transmission fluid temperature (tft) sensor (internal)
• Transmission range (tr) pressure switch assembly

5.7L (VIN R), Engine Performance Wiring Diagrams, Commercial Chassis (3 of 4) for GMC Forward Control P1996 3500

List of elements for 5.7L (VIN R), Engine Performance Wiring Diagrams, Commercial Chassis (3 of 4) for GMC Forward Control P1996 3500:

• (tail & stop lamps extension harness at crossmember in front of fuel tank) g415
• 5v ref
• A/c compressor high pressure cut-off switch (rear of a/c compressor)
• Eng-bat fuse 15a
• Engine coolant temperature (ect) sensor (front of intake manifold, near thermostat housing)
• Fuel gauge
• Fuel pump switch & engine oil pressure gauge sensor (top left rear of engine)
• Fuel sender & fuel pump (top of fuel tank)
• G110 (thermostat housing)
• G114 (rear of left cylinder head)
• G202 (left interior bulkhead near relay bracket) (body builder installed)
• Gauges fuse 20a
• Hot at all times
• Hot in (on) run & start (crank)
• I/p fuse block (dash panel provided by body builder) (body builder installed)
• Instrument cluster
• Intake air temperature (iat) sensor (engine air induction system elbow near remote air cleaner)
• Manifold absolute pressure (map) sensor (intake manifold, rear center)
• Map
• Mass air flow (maf) sensor (air intake system between air cleaner & engine)
• Nca
• Oil press gauge
• Pnk
• R100 (1100 ohms .75 watts)
• Red
• Ref lo
• Service engine soon indicator
• Speedo meter
• Tan
• Tan a
• Temp
• Throttle position (tp) sensor (intake system, left side)
• Trans fuse 10a

5.7L (VIN R), Engine Performance Wiring Diagrams, Commercial Chassis (4 of 4) for GMC Forward Control P1996 3500

List of elements for 5.7L (VIN R), Engine Performance Wiring Diagrams, Commercial Chassis (4 of 4) for GMC Forward Control P1996 3500:

• (dlc) (left interior bulkhead
• (engine harness, taped to ignition coil breakout)
• (left interior bulkhead near relay bracket) (body builder installed) g202
• (rear of left cylinder head) g114
• (thermostat housing) g110
• 5v ref
• 5v rtn
• 87a
• A/c request sig
• A/t
• A/t input speed sensor (transmission, left front)
• Brake sig
• Brake/transmission shift interlock (btsi) relay (left interior bulkhead on relay bracket)
• Clutch pedal position switch (left side of brake pedal bracket)
• Clutch sig
• Cylinder no.1
• Cylinder no.2
• Cylinder no.3
• Cylinder no.4
• Cylinder no.5
• Cylinder no.6
• Cylinder no.7
• Cylinder no.8
• Data link connector
• Distributor (top rear of engine)
• Ecm-bat fuse 20a
• Electronic ignition coil driver module (bracket at top edge of right cylinder head)
• Evap can purge sw sig
• Evaporative emmissions (evap) canister purge vacuum diagnostic switch (right front of engine above valve cover)
• Fuel pump a prime connector (taped to fuel pump relay breakout)
• Fuel pump relay (engine bulkhead relay bracket under battery junction block)
• Fuel pump rly ctrl
• G110 (thermostat housing)
• Gnd
• Ground
• High voltage coil wire
• Hot at all times
• Hot in (on) run
• I-3 fuse 15a
• I/p fuse block (dash panel provided by body builder) (body builder installed)
• Ign feed
• Ignition coil (bracket at top edge of right cylinder head)
• Ignition feed
• Input spd sens rtn
• Input spd sens sig
• M/t
• Mil ctrl
• Of relay bracket)
• On right side
• Pcs sol (hi)
• Pcs sol (lo)
• Pnk
• Pnk a
• Range sig "a"
• Range sig "b"
• Range sig "c"
• Red
• Serial data
• Service circuit power
• Spark plugs
• System gnd
• Tachometer (provision for) a
• Timing control return
• Timing control signal
• Timing ctrl sig
• Torque convertor clutch (tcc) & stop lamps switch (right side of steering column upper support)
• Vehicle control module (vcm) (vcm bracket bolted to left radiator support)
• Vss output

6.5L

6.5L (VIN F), Engine Performance Wiring Diagrams, Motor Home Chassis (1 of 4) for GMC Forward Control P1996 3500

List of elements for 6.5L (VIN F), Engine Performance Wiring Diagrams, Motor Home Chassis (1 of 4) for GMC Forward Control P1996 3500:

• (18 cm from breakout for left glow plugs) g112
• 12v
• 3/2 shift sol.
• 5 vref
• 5v ref volt
• A/c request sig
• A10
• A11 3 mode cruise a12
• B10
• B11
• B12
• Brake sw in
• Brake switch input
• C10
• C11
• C12
• C13
• C14
• C15
• C16
• Cam posit sens sig rtn
• Camshaft posit sens
• Closure gnd
• Coolant temperature sensor (lower left front of engine block)
• Cruise control or speed control switch
• Cruise ctrl sw engage
• Cruise eng sw retard
• D10
• D11
• D12
• D13
• D14
• D15
• D16
• Ect temp sens in
• Engine crank sens input
• Engine crank sensor (inside electronic injection pump)
• Force motor
• Force mtr hi
• Force mtr low
• Fuel pump input
• Fuel pump rly ctrl
• Fuel sol closure (5v sig)
• Fuel temp sens (5v sig)
• Glow plug "wait" lp out
• Glow plug relay
• Ground
• Heavy duty electronic 4-spd automatic overdrive transmission
• Intake man air temp sens
• Intake manifold air temperature sensor (at front of engine)
• Manifold absolute pressure sensor (on bulkhead, right of steering column)
• Map sens input
• On/off
• Pcs low
• Pnk
• Powertrain control module (pcm) (under right end of i/p, above blower motor)
• Range mode sel a
• Range mode sel b
• Range mode sel c
• Range mode selector
• Red
• Resume
• Second vss sig
• Sensor gnd
• Set
• Shift sol. a
• Shift sol. b
• Solid state
• Tan
• Timing stepper mtr (high)
• Timing stepper mtr (low)
• Tps no.1 gnd
• Tps no.1 ref volt
• Tps no.1 sig
• Tps no.2 gnd
• Tps no.2 sig
• Tps no.3 gnd
• Tps no.3 ref volt
• Tps no.3 sig
• Transmission input speed sensor (left side of transmission near front)
• Transmission speed input
• Transmission temp input
• Transmission temperature sensor
• Vehicle speed input
• Vehicle speed sensor (on transmission, left rear side)
• Vehicle speed sensor buffer (on driver's island support above accelerator pedal)
• Vss hi
• Vss lo
• Vss rtn
• Vss sig

6.5L (VIN F), Engine Performance Wiring Diagrams, Motor Home Chassis (2 of 4) for GMC Forward Control P1996 3500

List of elements for 6.5L (VIN F), Engine Performance Wiring Diagrams, Motor Home Chassis (2 of 4) for GMC Forward Control P1996 3500:

• App 1 sensor
• App 2 sensor
• App 3 sensor
• Brake transmission shift interlock (btsi) relay (mounted on top of support bracket at driver's island)
• Electronic accelerator pedal control (top of accelerator pedal bracket)
• Engine shutoff solenoid
• F4 i-3 fuse 15a f3
• Fuel sole- noid
• Fuel solenoid driver
• Fuel temp.
• G6 ecm-1 fuse 20a g5
• Haz fuse 15a
• Hazard lamps flasher (inner left side of main support bracket)
• High
• Hot at all times
• Hot in run
• Hot in run & start (crank)
• I/p fuse block (mounted on the i/p)
• Injection pump (top front of engine)
• J6 trans fuse 15a j5
• Low
• Optical 3 temperature sensor
• Pnk
• Red
• Stop- g7
• Stoplamp switch (at rear of brake pedal support bracket)
• Timing stepper motor
• Torque converter clutch & stoplamps switch (opens w/brake pedal depressed) (at rear of brake pedal support bracket)

6.5L (VIN F), Engine Performance Wiring Diagrams, Motor Home Chassis (3 of 4) for GMC Forward Control P1996 3500

List of elements for 6.5L (VIN F), Engine Performance Wiring Diagrams, Motor Home Chassis (3 of 4) for GMC Forward Control P1996 3500:

• (17 cm from rear/lamp harness) (from fuel tank crossmember) g415
• (18 cm from breakout for left glow plugs) g112
• (18 cm from breakout for left glow plugs) g112
• (not used)
• 87a
• A/c compressor control relay (right side of driver's island)
• A/c high pressure cut-off switch (on rear of the a/c compressor)
• Ecm- bat fuse 20a
• Eng- bat fuse 15a
• Fuel lift pump (inside left frame rail, below driver's door)
• Fuel pump oil pressure indicator switch (left rear of engine)
• Fuel pump relay (in underhood fuse & relay center)
• G202 (left side of i/p)
• Gauges fuse 20a
• Ground distribution
• Hot at all times
• Hot in run & start (crank)
• I/p fuse block (mounted on the i/p)
• In line to fuel pump prime (plant use)
• Instrument cluster
• Nca
• Oil press gauge
• Pnk
• R100
• Red
• Service engine soon indicator
• Service throttle soon indicator
• Speed meter
• Tan
• Wait to start "glow plugs" indicator
• Water in fuel indicator
• Water in-fuel indicator sensor (part of fuel injection pump)
• Water in-fuel input

6.5L (VIN F), Engine Performance Wiring Diagrams, Motor Home Chassis (4 of 4) for GMC Forward Control P1996 3500

List of elements for 6.5L (VIN F), Engine Performance Wiring Diagrams, Motor Home Chassis (4 of 4) for GMC Forward Control P1996 3500:

• "serv eng soon" ind
• "serv throttle soon" ind
• (dlc) (partial) (mounted on left side support bracket of steering column)
• 12v battery (fused)
• 12v battery fused
• 3/2 ctrl out
• A/c enable
• C10
• C11
• C12
• C13
• C14
• C15
• C16
• D10
• D11
• D12
• D13
• D14
• D15
• D16
• Data link connector
• Eng-1 h6
• Engine shutoff sol out
• Fuel heater (top rear of engine)
• Fuel sol module (5 vref)
• Fuel sol module feed
• Fuse 20a
• Fusible links
• G112 (18 cm from breakout for left glow plugs)
• G120 (right top cylinder head)
• G120 (right top of cylinder head)
• G202 (left side of i/p)
• Glow plug control relay (left rear of engine near bulkhead)
• Hot at all times
• Hot in run & start (crank)
• I/p fuse block (mounted on the i/p)
• Ignition
• Left bank glow banks
• Nca
• Pcm gnd
• Pnk
• Powertrain control module (pcm) (under right end of i/p, above blower motor)
• Red
• Right bank glow banks
• Serial data sig
• Shift sol a input
• Shift sol b input
• Tps no.2 ref voltage
• Turbo charger power valve solenoid
• Turbo chgr pwr vlv ctrl

6.5L (VIN Y), Engine Performance Wiring Diagrams, A/T Commercial Chassis (1 of 3) for GMC Forward Control P1996 3500

List of elements for 6.5L (VIN Y), Engine Performance Wiring Diagrams, A/T Commercial Chassis (1 of 3) for GMC Forward Control P1996 3500:

• (contact)
• (dlc) (partial) (left interior bulkhead on right side of relay bracket)
• (left interior bulkhead near relay bracket) (body builder installed) g202
• (rear of left cylinder head) (except diesel w:m/t) g114
• 1-2 shift sol ctrl
• 2-3 shift sol ctrl
• 5 volt ref
• 5v ref
• A10
• A11
• A12
• A6 a8
• B10
• B11
• B12
• Baro press sens sig
• Barometric pressure (baro) sensor (top of intake manifold, left side in back)
• Battery feed
• Brake pedal sw in
• Brake/transmission shift interlock (btsi) relay (left interior bulkhead on relay bracket)
• C10
• C11
• C12
• C13
• C14
• C15
• C16
• D10
• D11
• D12
• D13
• D14
• D15
• D16
• Data link connector
• Ecm-bat fuse 20a
• Eng bat fuse 15a
• Engine speed sens in
• Engine speed sensor (in fuel injection pump)
• Hot at all times
• Hot in (on) run
• I-3 fuse 15a
• I/p fuse block (dash panel provided by body builder) (body builder installed)
• Ign feed
• Pnk
• Press ctrl sol (hi)
• Press ctrl sol (lo)
• Range signal a
• Range signal b
• Range signal c
• Red
• Ref 5 volt
• Rtn sensor
• Sensor return
• Sensor rtn
• Serial data
• Service trans out
• Sig sensor
• Tan
• Tcc pwm sol ctrl
• Tcm ground
• Tft sig
• Throttle position sensor (tps) (right side of fuel injection pump)
• Torque converter clutch (tcc) & stop lamps switch (opens w/brake pedal depressed) (right side of steering column upper support)
• Tp sens sig
• Transmission control module (tcm) (left interior bulkhead on top of relay bracket)
• Vehicle speed sig

6.5L (VIN Y), Engine Performance Wiring Diagrams, A/T Commercial Chassis (2 of 3) for GMC Forward Control P1996 3500

List of elements for 6.5L (VIN Y), Engine Performance Wiring Diagrams, A/T Commercial Chassis (2 of 3) for GMC Forward Control P1996 3500:

• 1-2 shift solenoid
• 10a
• 2-3 shift solenoid
• Acc
• Automatic transmission (a/t) (rear of engine)
• Battery junction block (left side of engine bulkhead, above relay bracket)
• Closed in park & neutral
• Crank fuse (engine harness, in-line fuse block near right side of steering column upper support)
• Crk (start)
• Distribution
• Ecm-1 fuse 20a
• Fuel injection pump fuel shut-off solenoid (at fuel injection pump)
• G202 (left interior bulkhead near relay bracket) (body builder installed)
• Gauges fuse 20a
• Glow plugs
• Hot at all times
• Hot in (on) run & start (crank)
• I/p fuse block (dash panel provided by body builder) (body builder installed)
• Ignition switch
• Instrument cluster
• Lock
• Off
• On (run)
• Park/neutral position (pnp) & backup lamps switch (left side near middle of transmission)
• Pnk
• Power
• Pressure control solenoid
• Red
• S stud
• Speedo meter
• Starter relay (engine bulkhead relay bracket under battery junction block)
• Starter solenoid (starter at lower right side of engine)
• Stud
• System
• Tcc pwm solenoid
• Trans
• Transmission fluid temperature (tft) sensor
• Transmission range (tr) pressure switch assembly
• Water in- fuel

6.5L (VIN Y), Engine Performance Wiring Diagrams, A/T Commercial Chassis (3 of 3) for GMC Forward Control P1996 3500

List of elements for 6.5L (VIN Y), Engine Performance Wiring Diagrams, A/T Commercial Chassis (3 of 3) for GMC Forward Control P1996 3500:

• (coil)
• (rear of left cylinder head) (except diesel w: m/t) g114
• (rear of left cylinder head) (except diesel w:m/t) g114
• Auxiliary engine coolant fan relay (left side of engine bulkhead above relay bracket)
• Battery junction block (left side of engine bulkhead, above relay bracket)
• C (not used)
• D100 (engine harness approx. 20 cm from brake pressure differential switch breakout)
• Eng-1 fuse 20 a
• Fuel heater (rear of intake manifold, part of fuel/water separator (filter))
• Fuel injection pump cold advance solenoid (in fuel injection pump)
• Fuel injection pump cold advance solenoid engine coolant temperature (ect) switch (opens as temperature increases) (right rear of right cylinder head)
• Fusible link
• G114 (rear of left cylinder head) (except diesel w: m/t)
• G114 (rear of left cylinder head) (except diesel w:m/t)
• Glow plug stud
• Glowplug control switch (rear of left cylinder head)
• Ground
• Hot at all times
• Hot in (on) run & start (crank)
• I/p fuse block (dash panel provided by body builder) (body builder installed)
• Idle speed control (isc) solenoid actuator (bracket on front of fuel injection pump)
• Ign feed
• Ind lamp out
• Left bank glowplugs (cylinder heads below valve covers)
• Nca
• Pnk
• Power distribution system
• Red
• Right bank glowplugs (cylinder heads below valve covers)
• Starter feed
• Stud
• Trans fuse 10a
• Vehicle speed sensor (vss) (left rear of transmission near center)
• Vehicle speed sensor (vss) buffer (mounted under bracket bolted to left side of interior bulkhead)
• Vss
• Vss out
• Vss rtn
• Vss sig
• Water in-fuel sensor (part of fuel/water separator (filter) at rear of intake manifold)

6.5L (VIN Y), Engine Performance Wiring Diagrams, M/T Commercial Chassis (1 of 2) for GMC Forward Control P1996 3500

List of elements for 6.5L (VIN Y), Engine Performance Wiring Diagrams, M/T Commercial Chassis (1 of 2) for GMC Forward Control P1996 3500:

• (generator bracket) (diesel w:m/t) g119
• Auxiliary engine coolant fan relay (left side of engine bulkhead above relay bracket)
• Battery junction block (left side of engine bulkhead, above relay bracket)
• Ecm-1 fuse 20 a
• Eng-1 fuse 20 a
• Fuel heater (rear of intake manifold, part of fuel/water separator (filter))
• Fuel injection pump fuel shut-off solenoid (at fuel injection pump)
• Fusible link
• Glow plug stud
• Glowplug control switch (rear of left cylinder head)
• Ground
• Hot at all times
• Hot in (on) run & start (crank)
• I/p fuse block (dash panel provided by body builder) (body builder installed)
• Ign feed
• Left bank glowplugs (cylinder heads below valve covers)
• Nca
• Pnk
• Power distribution system
• Red
• Right bank glowplugs (cylinder heads below valve covers)
• Starter feed
• Stud

6.5L (VIN Y), Engine Performance Wiring Diagrams, M/T Commercial Chassis (2 of 2) for GMC Forward Control P1996 3500

List of elements for 6.5L (VIN Y), Engine Performance Wiring Diagrams, M/T Commercial Chassis (2 of 2) for GMC Forward Control P1996 3500:

• (not used)
• 10a
• A pnk
• Acc
• Battery junction block (left side of engine bulkhead, above relay bracket)
• Clutch pedal position (cpp) switch (closed with clutch pedal depressed) (left side of brake pedal bracket)
• Crank fuse (engine harness, in-line fuse block near right side of steering column upper support)
• Crk (start)
• D100 (engine harness, approx. 29 cm from brake pressure differential switch breakout)
• Fuel injection pump cold advance solenoid (in fuel injection pump)
• Fuel injection pump cold advance solenoid engine coolant temperature (ect) switch (opens as temperature increases) (right rear of right cylinder head)
• G119 (generator bracket) (diesel w: m/t)
• G202 (left interior bulkhead near relay bracket) (body builder installed)
• Gauges fuse 20a
• Glow plugs
• Ground
• Hot at all times
• Hot in (on) run & start (crank)
• I/p fuse block (dash panel provided by body builder) (body builder installed)
• Idle speed control (isc) solenoid actuator (bracket on front of fuel injection pump)
• Ign feed
• Ignition switch
• Ind lamp out
• Instrument cluster
• Lock
• Nca
• Off
• On (run)
• Pnk
• Power distribution system
• Red
• S stud
• Starter relay (engine bulkhead relay bracket under battery junction block)
• Starter solenoid (starter at lower right side of engine)
• Stud
• Water in- fuel
• Water in-fuel sensor (part of fuel/water separator (filter) at rear of intake manifold)

7.4L

7.4L (VIN J), Engine Performance Wiring Diagrams, Motor Home Chassis (1 of 4) for GMC Forward Control P1996 3500

List of elements for 7.4L (VIN J), Engine Performance Wiring Diagrams, Motor Home Chassis (1 of 4) for GMC Forward Control P1996 3500:

• 1-2 shift sol ctrl
• 12v ign feed
• 2-3 shift sol ctrl
• A pnk
• A/c compressor control relay (right side of driver's island)
• A/c enable
• Cam posit sens signal
• Camshaft position sensor (internal to ignition distributor)
• Ckp posit sens rtn
• Crankshaft position sensor (on lower rifght front of engine, behind torsional damper)
• Ect sens signal
• Egr posit input
• Egr sol ctrl
• Evap can purge valve
• Evaporative emissions canister purge solenoid (at top left center of engine behind a/c compressor)
• Heated oxygen sensor no.1 (on right exhaust pipe ahead of catalytic converter)
• Idle air control valve motor (on right side of engine at throttle bore intake)
• Idle air ctrl a hi (iac)
• Idle air ctrl b lo (iac)
• Ign feed
• Injector no.1 ctrl
• Injector no.2 ctrl
• Injector no.3 ctrl
• Injector no.4 ctrl
• Injector no.5 ctrl
• Injector no.6 ctrl
• Injector no.7 ctrl
• Injector no.8 ctrl
• Intake air temp sens
• Knock sens signal
• Knock sensor (on left side of engine block below exhaust manifold)
• Knock sensor (on right side of engine block ahead of starter)
• Left post cat sens hi
• Left sens hi (pre cat)
• Left sens lo (pre cat)
• Left wheel speed sensor (on left front wheel assembly)
• Map signal
• Mass air flow sens sig
• Nca
• Pnk
• Pnk d
• Pnk pnk pnk
• Right post cat sens lo
• Right sens hi (pre cat)
• Right sens lo (pre cat)
• Right wheel speed sensor (on right front wheel assembly)
• Sens high
• Sens low
• Sens rtn
• Sens sig
• Sensor rtn
• Sensor signal
• Signal
• Tan
• Tan a
• Tcc sol ctrl
• Temp sens input
• Throttle posit sens
• Vehicle control module (vcm) (mounted to top of radiator support)
• Vehicle speed sensor (0n transmission, left rear side)
• Vss rtn
• Vss signal

7.4L (VIN J), Engine Performance Wiring Diagrams, Motor Home Chassis (2 of 4) for GMC Forward Control P1996 3500

List of elements for 7.4L (VIN J), Engine Performance Wiring Diagrams, Motor Home Chassis (2 of 4) for GMC Forward Control P1996 3500:

• Automatic transmission
• Ecm-1 fuse 20a
• Eng-1 fuse 20a
• Fluid temperature sensor internal
• Force motor
• Fuel inj. no.1
• Fuel inj. no.2
• Fuel inj. no.3
• Fuel inj. no.4
• Fuel inj. no.5
• Fuel inj. no.6
• Fuel inj. no.7
• Fuel inj. no.8
• G117 (engine) (13 cm from breakout for ignition coil)
• Heated oxygen sensor no.2 (on left exhaust pipe ahead of catalytic converter)
• Heated oxygen sensor no.3 (on right exhaust pipe behind of catalytic converter)
• Heated oxygen sensor no.4 (on left exhaust pipe behind of catalytic converter)
• Hot in run & start (crank)
• I/p fuse block (mounted on the i/p)
• Ignition
• Intake air temp sensor (mounted in fresh air intake behind right side of air filter box)
• Linear egr solenoid valve (on left side of intake plenum)
• Nca
• Pnk
• Pnk d
• Pnk e
• Pnk n pressure
• Pnk pnk
• Red p pressure
• Solenoid 1-2
• Solenoid 2-3
• Switch
• Tan
• Tan a

7.4L (VIN J), Engine Performance Wiring Diagrams, Motor Home Chassis (3 of 4) for GMC Forward Control P1996 3500

List of elements for 7.4L (VIN J), Engine Performance Wiring Diagrams, Motor Home Chassis (3 of 4) for GMC Forward Control P1996 3500:

• (10 cm from breakout for generator (engine) g120
• (17 cm from rear/lamp harness) (from fuel tank crossmember) g415
• A/c high pressure cut-off switch (on rear of the a/c compressor)
• Eng-bat fuse 15a f1
• Engine coolant temperature sensor (on center lower left side of engine cylinder head)
• Fuel gauge
• Fuel pump & sender (on top of fuel tank)
• Fuel pump/ oil pressure switch (on engine block, top rear, behind distributor)
• G202 (left side of i/p)
• Gauges fuse 20a
• Ground distribution system
• Hot at all times
• Hot in run & start (crank)
• I/p fuse block (mounted on the i/p)
• Instrument cluster
• Manifold absolute pressure (map) sensor (mounted into intake manifold behind thermostat)
• Mass air flow sensor (mounted in fresh air intake behind air filter box)
• Nca
• Oil press gauge
• Pnk
• R100 (4 cm from breakout for auxiliary cooling fan)
• Red
• Service engine soon indicator
• Speed meter
• Tan
• Throttle position sensor (on right side of intake plenum at throttle intake)
• Trans fuse 10a

7.4L (VIN J), Engine Performance Wiring Diagrams, Motor Home Chassis (4 of 4) for GMC Forward Control P1996 3500

List of elements for 7.4L (VIN J), Engine Performance Wiring Diagrams, Motor Home Chassis (4 of 4) for GMC Forward Control P1996 3500:

• (10 cm from breakout for generator) (engine) g120
• (20 cm from breakout for connector under the i/p) g202
• (mounted on left side support bracket of steering column)
• 5v ref
• 5v return
• 87a
• A/c request signal
• B +
• Brake sw input
• Brake/transmission shift interlock (btsi) relay (mounted on top of support bracket at driver's island)
• Check engine lp ctrl
• Connector (dlc) (partial)
• Cruise control module (on radiator support bracket, behind left side of vehicle control module)
• Cruise ctrl engaged
• Cruise ctrl sig-engaged
• Cylinder no.1
• Cylinder no.2
• Cylinder no.3
• Cylinder no.4
• Cylinder no.5
• Cylinder no.6
• Cylinder no.7
• Cylinder no.8
• Data link
• Distributor
• Ecm-bat fuse 20a
• Elec spk timing ctrl sig
• Elec spk timing ctrl signal
• Est ctrl
• Evap can purge vac in
• Evaporative emissions canister purge vacuum switch (top left center of engine behind a/c compressor)
• For tachometer
• Force mtr feed
• Force mtr rtn
• Fuel pmp rly ctrl
• Fuel pump prime connector
• Fuel pump relay (at relay center right side of main support at driver's island)
• G120 (engine) (10 cm from breakout for generator)
• Ground
• High voltage coil wire
• Hot at all times
• Hot in run
• I-3 fuse 15a
• I/p fuse block (mounted on the i/p)
• Ign feed
• Ignition coil (on bracket at rear of intake plenum)
• Ignition coil driver (on bracket at rear of intake plenum)
• Input speed sensor (hd transmission only)
• Pnk
• Pnk a
• Press sw sig
• Provision a
• Red
• Sens ground
• Sens rtn
• Serial data
• Service circuit power
• Spark plugs
• Speed sensor input
• Tcc/stoplamp input
• Torque converter clutch (tcc) & stoplamps switch or tcc stoplamp switch (opens w/brake depressed) (at rear of brake pedal support bracket)
• Vehicle control module (vcm) (mounted to top of radiator support)
• Vss output
• Vss signal

7.4L (VIN N), Engine Performance Wiring Diagrams, Motor Home Chassis (1 of 3) for GMC Forward Control P1996 3500

List of elements for 7.4L (VIN N), Engine Performance Wiring Diagrams, Motor Home Chassis (1 of 3) for GMC Forward Control P1996 3500:

• (20 cm from breakout for chassis harness wires) (engine)
• 3-2 ctrl out
• 5v ref
• A/t input speed sensor (on auto transmission left center)
• A10
• A11
• A12
• A13
• A14
• A15
• A16
• B10
• B11
• B12
• B13
• B14
• B15
• B16
• Battery
• Brake sw input
• Bypass 5 volts
• Can purge sol out
• Data link connector (dlc) (partial) (mounted on left side support bracket of steering column)
• Diag enable-powertrain
• E10
• E11
• E12
• E13
• E14
• E15
• E16
• Ect sens input
• Egr input
• Egr sol out
• Electronic 4-spd automatic overdrive transmission
• Evaporative canister purge solenoid (top left center of intake manifold)
• F10
• F11
• F12
• F13
• F14
• F15
• F16
• Force motor
• Force motor hi
• Force motor low
• Fuel inj ctrl
• Fuel pmp rly ctrl
• Ground
• High idle sw out
• Hot in run & start (crank)
• I/p fuse block (mounted on the i/p)
• Ic output
• Idle air control valve motor (on left side of throttle body intake)
• Idle air valve ctrl
• Ignition
• Knock sens input
• Knock sensor (ks) (on right side of engine block ahead of starter)
• Map sens input
• Oil press input
• Oxygen sens input
• Oxygen sensor (in exhaust stream ahead of muffler)
• Pcm ground
• Pnk
• Pnk pnk
• Powertrain control module (pcm) (on left side of driver's island)
• Range mode sel a
• Range mode sel b
• Range mode sel c
• Range mode selector
• Red
• Ref pulse input hi
• Ref pulse input lo
• Sens ground
• Serial data uart
• Serv eng soon ind ctrl
• Shift sol a out
• Shift sol b out
• Shift sol. a
• Shift sol. b
• Shift sol. c
• Shift sol. d
• Speed sens input high
• Speed sens input lo
• Tan
• Tp sens in
• Trans fuse 10a
• Trans temp input
• Trans. temp.
• Vehicle speed input

7.4L (VIN N), Engine Performance Wiring Diagrams, Motor Home Chassis (2 of 3) for GMC Forward Control P1996 3500

List of elements for 7.4L (VIN N), Engine Performance Wiring Diagrams, Motor Home Chassis (2 of 3) for GMC Forward Control P1996 3500:

• (20 cm from breakout for chassis harness wires) (engine)
• (contact)
• 12v
• 20a
• Bat fuse e1
• Brake/transmission shift interlock (btsi) relay (mounted on top of support bracket at driver's island)
• Cruise control module (on radiator support bracket)
• Ecm- e2
• Engine coolant temperature sensor (front & center of engine coolant intake)
• Fuel pump & oil pressure indicator switch (on engine block, front left lower side behind timing cover)
• Ground
• H6 eng-1 fuse 20a
• Hot at all times
• Hot in run
• Hot in run & start (crank)
• I-3 fuse 15a
• I/p fuse block (mounted on the i/p)
• Idle speed control actuator (on throttle body)
• Linear egr solenoid valve (no component location available)
• Manifold absolute pressure (map) sensor (on bracket mounted on right side of intake manifold)
• Pnk
• Red
• Second. vss
• Tan
• Tcc/brake switch or torque convertor clutch (tcc) & stop lamps switch (opens w/brake pedal depressed) (at rear of brake pedal support bracket)
• Tcc/stoplamp input
• Throttle position sensor (on left side of throttle body)
• Vehicle speed sensor (on left rear side of transmission)
• Vehicle speed sensor buffer (on driver's island support above accelerator pedal)
• Vss
• Vss hi
• Vss lo
• Vss out
• Vss return
• Vss sig

7.4L (VIN N), Engine Performance Wiring Diagrams, Motor Home Chassis (3 of 3) for GMC Forward Control P1996 3500

List of elements for 7.4L (VIN N), Engine Performance Wiring Diagrams, Motor Home Chassis (3 of 3) for GMC Forward Control P1996 3500:

• (17 cm from rear/lamp harness) (from fuel tank crossmember) g415
• (20 cm from breakout for chassis harness wires) (engine)
• Acc
• Battery junction block (on forward left side of bulkhead)
• Bypass
• C103
• Dist. ref hi
• Dist. ref lo
• Distributor
• Ecm 1 fuse 20a
• Fuel gauge
• Fuel pump & sender (on top of fuel tank)
• Fuel pump prime connector
• Fuel pump relay (at relay center right side of main support at driver's island)
• G202 (left side of i/p)
• Gauges fuse 20a
• Ground distribution system
• High voltage ignition coil wire
• Hot at all times
• Hot in run & start (crank)
• I/p fuse block (mounted on the i/p)
• Ignition coil (on bracket at rear of intake plenum)
• Ignition module
• Ignition switch
• Instrument cluster
• Lock off
• Oil press gauge
• Pickup coil
• Pnk
• Red
• Run
• S107
• Service engine soon indicator
• Speed meter
• Start
• Tachometer test lead
• Tan
• Throttle body fuel injector no.1 (on top of intake manifold)
• Throttle body fuel injector no.2 (on top of intake manifold)

EXTERIOR LIGHTS

Backup Lamps Wiring Diagram, Commercial Chassis for GMC Forward Control P1996 3500

List of elements for Backup Lamps Wiring Diagram, Commercial Chassis for GMC Forward Control P1996 3500:

• (left side of trans.) backup lamps switch
• A/t
• Hot in run
• I/p fuse block
• M/t
• Park/neutral position (pnp) & backup lamp switch (left side of trans.)
• Provision for left backup lamp
• Provision for right backup lamp
• Turn b/u fuse 15a
• Turn signal flasher (i/p fuse block)

Backup Lamps Wiring Diagram, Motor Home Chassis for GMC Forward Control P1996 3500

List of elements for Backup Lamps Wiring Diagram, Motor Home Chassis for GMC Forward Control P1996 3500:

• (left side of trans.) backup lamp switch
• 7.4l vin n (l19) engine
• All except 7.4l vin n (l19) engine
• Hot in run
• I/p fuse block
• Park/neutral position (pnp) & backup lamp switch (left side of trans.)
• Provision for backup lamps (on left frame rail near rear lamp harness)
• Provision for not used (near breakout for steering column harness)
• Turn b/u fuse 15a
• Turn signal flasher (i/p fuse block)

Exterior Lamps Wiring Diagram, Commercial Chassis for GMC Forward Control P1996 3500

List of elements for Exterior Lamps Wiring Diagram, Commercial Chassis for GMC Forward Control P1996 3500:

• Backup lamps circuit
• C205 (near i/p fuse block)
• G114 (all except diesel w/ m/t & gas v6 engine) (rear of left cylinder head)
• G119 (diesel w/ m/t & gas v6 engine) (diesel: generator bracket; gas: thermostat housing)
• Hazard
• Hazard lamps flasher (left inner bulkhead on relay bracket)
• Head
• Headlamps switch
• Hot at all times
• Hot in run
• I/p fuse block
• Instrument cluster
• Interior lamps system
• Left front park & turn signal (t/s) lamp
• Left front side marker lamp
• Left rear license lamps
• Left turn ind.
• Normal
• Off
• Park
• Provision for center high mounted stop lamp
• Provisions for left rear side marker lamp
• Provisions for left tail/stop & turn signal lamps
• Provisions for marker lamps
• Provisions for right rear side marker lamp
• Provisions for right tail/stop & turn signal lamps
• Right front park & turn signal (t/s) lamp
• Right front side marker lamp
• Right rear license lamps
• Right turn ind.
• Stop
• Stop haz fuse 15a
• Tail
• Tail lamps fuse 20a
• Torque converter clutch & stop lamps switch (right side of steering column upper support)
• Turn
• Turn b/u fuse 15a
• Turn left
• Turn right
• Turn signal flasher
• Turn signal switch

Exterior Lamps Wiring Diagram, Motor Home Chassis for GMC Forward Control P1996 3500

List of elements for Exterior Lamps Wiring Diagram, Motor Home Chassis for GMC Forward Control P1996 3500:

• Backup lamps circuit
• Cruise control system
• G112 (6.5l vin f (l65) engine) (near breakout for left glow plugs)
• G120 (7.4l vin j (l29) engine) (near breakout for generator)
• Hazard
• Hazard lamps flasher (inner left side of main support bracket)
• Head
• Headlamps switch
• Hot at all times
• Hot in run
• I/p fuse block
• Instrument cluster
• Interior lamps system
• Left front park & turn signal (t/s) lamp
• Left turn ind.
• No ground available (7.4l vin n (l19) engine) (near breakout for chassis harness)
• Normal
• Off
• Park
• Provision for center high mounted stop lamp
• Provisions for left front side marker lamp
• Provisions for left rear license lamp
• Provisions for left rear side marker lamp
• Provisions for left tail, stop & turn signal (t/s) lamps
• Provisions for marker lamps
• Provisions for right front side marker lamp
• Provisions for right rear license lamp
• Provisions for right rear side marker lamp
• Provisions for right tail, stop & turn signal (t/s) lamps
• Provisions for roof marker lamps
• Right front park & turn signal (t/s) lamp
• Right turn ind.
• Stop haz fuse 15a
• Tail lamps fuse 20a
• Torque converter clutch & stop lamps switch (brake pedal support bracket)
• Turn
• Turn b/u fuse 15a
• Turn left
• Turn right
• Turn signal flasher
• Turn signal switch

GROUND DISTRIBUTION

Ground Distribution Wiring Diagram, Commercial Chassis (1 of 2) for GMC Forward Control P1996 3500

List of elements for Ground Distribution Wiring Diagram, Commercial Chassis (1 of 2) for GMC Forward Control P1996 3500:

• (forward lamps harness by left lamps breakout) (body builder installed) g106
• (forward lamps harness by right lamps breakout) (body builder installed) g107
• (left frame rail to rear of left cylinder head) g112
• (left interior bulkhead near relay bracket) (body builder installed) g202
• (rear of left cylinder head) (except diesel w:m/t) g114
• (rear of right cylinder head to battery) g120
• 1996 vftc c
• A/c compressor clutch coil
• A/c compressor clutch coil
• A/c compressor clutch coil diode (d101)
• A/c compressor clutch relay
• Automatic transmission only
• Auxiliary engine coolant fan
• Auxiliary engine coolant fan a/c pressure switch
• Battery
• Braided
• Brake/ transmission shift interlock (btsi) relay
• Brake/ transmission shift interlock (btsi) solenoid
• Canadian models only
• Data link connector (dlc)
• Daytime running lamp (drl) control module
• Daytime running lamp (drl) relay
• Diesel engine
• Engine
• Engine coolant level switch
• G114 (rear of left cylinder head to left frame rail)
• G207
• Gasoline engines
• Heated oxygen sensor (ho2s) left pre- convertor
• Heated oxygen sensor (ho2s) post converter (4.3l vin w (l35) engine) heated oxygen sensor (ho2s) left post converter (5.7l vin r (l31) engine)
• Heated oxygen sensor (ho2s) right post converter (5.7l vin r (l31) engine)
• Heated oxygen sensor (ho2s) right pre- convertor
• Horn hi tone (f-note)
• Horn low tone (a-note)
• I/p lamps dimmer switch
• Instrument cluster
• Left headlamp
• Nca
• Nca (899)
• Park brake indicator switch
• Prndl lamp
• Right headlamp
• Seat belt alarm
• Secondary battery
• Starter relay
• Steering column
• Steering column on lower mounting stud of headlamps dimmer switch
• W/6.5l vin y (l57) diesel engine
• W/o daytime running lamps (drl)

Ground Distribution Wiring Diagram, Commercial Chassis (2 of 2) for GMC Forward Control P1996 3500

List of elements for Ground Distribution Wiring Diagram, Commercial Chassis (2 of 2) for GMC Forward Control P1996 3500:

• (generator bracket)
• (rear of left cylinder head) g114
• (rear of left cylinder head)
• (right rear of rear lamps harness) (body builder installed) g415
• (tail & stop lamps extension harness at crossmember in front of fuel tank) g415
• (thermostat housing) g110
• 1996 vftc c
• 5.7l vin r (l31) engine only
• A/c compressor high pressure cutoff switch
• Automatic transmission
• Automatic transmission only
• Data link connector (dlc)
• Diesel engine
• Drain wire (shield)
• Electronic ignition (ei) coil driver module
• Evaporative emissions (evap) canister purge vacuum diagnostic switch
• Fuel heater
• Fuel pump relay
• Fuel sender & fuel pump
• G119 (diesel w: m/t) g114 (except diesel w: m/t)
• Gasoline engines
• Glow plug control switch
• Instrument cluster
• Manual transmission
• Mass air flow sensor (maf) or mass air flow (maf) sensor
• Nca
• Nca (450)
• R100 (1100 ohms .75 watts)
• Rear lamps
• Side marker lamp,left rear (provisions for)
• Side marker lamp,right rear (provisions for)
• Transmission control module (tcm)
• Vehicle control module (vcm)
• Vehicle speed sensor (vss) buffer
• Water in-fuel sensor

Ground Distribution Wiring Diagram, Motor Home Chassis (1 of 2) for GMC Forward Control P1996 3500

List of elements for Ground Distribution Wiring Diagram, Motor Home Chassis (1 of 2) for GMC Forward Control P1996 3500:

• (10 cm from breakout for generator) (18 cm from breakout for left glow plugs)
• (102 cm from breakout harness for the right headlamps) (right frame rail ground) g101
• (18 cm from breakout to left glow plugs) (left park lamp ground) g112 (6.5l vin f (l65) engine) (7.4l vin j (l29) & vin n (l19) (engines) (left frame rail ground)
• (20 cm from breakout for chassis harness wires)
• (23 cm from breakout for the right headlamps) (right park lamp ground) g106
• (7.4l vinj (l29) engine) (6.5l vinf (l65) engine)
• (braided strap from rear left of engine to frame rail) (left frame rail ground) g114 (6.5l vin f (l65) engine) (7.4l vin j (l29) & vin n (l19) engines (left frame rail ground)
• (engine) (7.4l vin n (l19) engine) (g120) (g112)
• 1996 vftc c
• 6.5l
• 7.4l
• 7.4l vin j (l29) engine
• A/c compressor high pressure cutoff switch
• A12
• Battery
• Braided strap
• C1 vin f (l65)
• C3 vin j (l29)
• Canadian models only
• Canadian models only w/ dual headlamps
• Center high mounted stop lamps (provisions, for)
• Cruise control module
• Cruise control module (7.4l vin n (l19) & 7.4l vin j (l29) engines)
• Data link connector (dlc) (7.4l vin j & 6.5l vin f engines only)
• Daytime running lamps relay (drl)
• Dual headlamps w/drl
• Engine
• Evaporative emissions canister purge vacuum switch
• Fuel pump relay
• G101 (right frame rail ground) (102 cm from breakout harness for right headlamps)
• G106 (right park lamp ground) (23 cm from breakout for right park lamp ground)
• G120 (right frame rail ground)
• Headlamps w/o drl
• Ignition coil driver
• Instrument cluster
• Left headlamp
• Left high beam headlamp
• Left horn
• Mass air flow sensor (7.4l vin j (l29) engine)
• Nca
• Powertrain control module (pcm) (6.5l vin f (l65) engine)
• Powertrain control module (pcm) (7.4l vin n (l19) engine
• R100 (no resistance or wattage values available)
• R101 (no resistance or wattage values available)
• Right headlamp
• Right high beam headlamp
• Right horn
• Secondary battery (diesel only)
• Single & dual headlamps w/drl
• Stop lamp switch
• Vehicle control module (vcm) (7.4l vin j (l29) engine)
• Vehicle control module (vcm) (7.4l vin j (l29) engine) powertrain control module (pcm) (6.5l vin f (l65) engine)
• Vehicle speed sensor buffer (7.4l vin n (l19) & 6.5l vin f (l65) engines)
• Vss shield

Ground Distribution Wiring Diagram, Motor Home Chassis (2 of 2) for GMC Forward Control P1996 3500

List of elements for Ground Distribution Wiring Diagram, Motor Home Chassis (2 of 2) for GMC Forward Control P1996 3500:

• (17 cm from rear/lamp harness, near fuel tank crossmember) g415
• (7.4l vin j (l29) engine)
• (engine) (13 cm from breakout for the ignition coil) g117 (6.5l vin f (l65) engine) (no ground location available)
• (left frame rail ground)
• 1996 vftc c
• 6.5l vin f (l65) engine
• 6.5l vin f (l65) engine (nj9) 80 gallon
• 7.4l vin j (l29) engine
• 7.4l vin n (l19) & 7.4l vin j (l29) engines
• 87a
• A/c compressor clutch coil
• A/c compressor control relay
• A/c compressor control relay (7.4l vin n (l19) engine)
• Auxiliary engine coolant fan a/c pressure switch
• Brake/ transmission shift interlock (btsi) relay
• Brake/ transmission shift interlock (btsi) solenoid
• Canadian models only
• D100
• Data link connector (dlc) (7.4l vin j (l29) & 6.5l vin f (l65) engines)
• Daytime running lamp control module (drl)
• Daytime running lamp relay (drl)
• Engine coolant fan motor
• Engine coolant level (ecl) switch (6.5l vin f (l65) engine)
• Fuel heater
• Fuel lift pump
• Fuel pump & sender
• Fuel sender
• G202 (left side of i/p)
• Glow plug control relay
• Heated oxygen sensor no.1
• Heated oxygen sensor no.2
• Heated oxygen sensor no.3
• Heated oxygen sensor no.4
• I/p fuse block (mounted on i/p fuse block)
• Instrument cluster
• Instrument panel dimmer switch
• Nca
• Powertrain control module (pcm)
• Pulse wiper control module
• Seatbelts/lamps alarm module
• Starter relay
• Steering column ground
• Tail, stop, turn signal (t/s) lamps, left (provisions for)
• Tail, stop, turn signal (t/s) lamps, right (provisions for)
• Transmission range indicator lamp
• Water in fuel indicator sensor

HEADLIGHTS

Headlight Wiring Diagram, Commercial Chassis with DRL for GMC Forward Control P1996 3500

List of elements for Headlight Wiring Diagram, Commercial Chassis with DRL for GMC Forward Control P1996 3500:

• (provision for fog lamps)
• 1996 vftc c
• 87a
• Accy
• Bulb test
• C204 (i/p harness, near drl module)
• Daytime running lamps (drl) module (attached to i/p harness at steering column)
• Daytime running lamps (drl) relay (left interior bulkhead, on relay bracket)
• Drl indicator
• Drl relay ctrl
• Fog lamps
• G106 (forward lamps harness, by right lamps breakout)
• G119 (diesel w/ m/t & gas v6) (diesel: generator bracket; gas: thermostat housing)
• G202 (left interior bulkhead, near relay bracket)
• Gauges fuse 20a
• Ground
• Head
• Head- lamp dimmer switch
• Headlamps switch
• Hi beam indicator
• Hi bm feed
• Hi bm indicator
• Hot at all times
• Hot in run or start
• I/p fuse block
• Ignition
• Ignition switch
• Inline diode (i/p harness)
• Instru- ment cluster system
• Instrument cluster
• Instrument cluster system
• Lamp feed
• Left head- lamp
• Lock
• Off
• Park
• Park brake in
• Park brake indicator switch (on park brake)
• Pnk
• Right head- lamp
• Run
• Start
• Tan

Headlight Wiring Diagram, Commercial Chassis without DRL for GMC Forward Control P1996 3500

List of elements for Headlight Wiring Diagram, Commercial Chassis without DRL for GMC Forward Control P1996 3500:

• C 1995 vftc
• G106 (forward lamps harness, by right lamps breakout)
• G114 (all except diesel w/ m/t & gas v6) (rear of left cylinder head)
• G119 (diesel w/ m/t & gas v6) (diesel: generator bracket; gas: thermostat housing)
• Head
• Headlamps dimmer switch
• Headlamps switch
• Hi beam indicator
• Hot at all times
• Instrument cluster
• Left hi headlamp
• Off
• Park
• Right lo headlamp
• Tan

Headlight Wiring Diagram, Motor Home Chassis with Dual Headlamps DRL for GMC Forward Control P1996 3500

List of elements for Headlight Wiring Diagram, Motor Home Chassis with Dual Headlamps DRL for GMC Forward Control P1996 3500:

• (provision for fog lamps)
• 1996 vftc c
• 87a
• Accy
• Bulb test
• Daytime running lamps (drl) module (attached to i/p harness at steering column)
• Daytime running lamps (drl) relay #2
• Daytime running lamps (drl) relay (on main support bracket at driver's island)
• Diode network
• Drl indicator
• Drl relay ctrl
• Fog lamps
• G106 (forward lamps harness, by right lamps breakout)
• G120 (7.4l vin j (l29)) (near breakout for generator) (7.4 vin n (l19): n0 ground point available, near breakout for chassis harness)
• G202 (under i/p)
• G202 under i/p)
• Gauges fuse 20a
• Ground
• Head
• Head- lamp dimmer switch
• Headlamps switch
• Hi beam indicator
• Hi bm feed
• Hi bm indicator
• Hot at all times
• Hot in run or start
• I/p fuse block
• Ignition
• Ignition switch
• Instrument cluster
• Instrument cluster system
• Lamp feed
• Left head- lamp
• Left hi beam head- lamp
• Lock
• Off
• Park
• Park brake in
• Park brake indicator switch (on park brake)
• Pnk
• Right head- lamp
• Right hi beam head- lamp
• Run
• Start
• Tan

Headlight Wiring Diagram, Motor Home Chassis with Single Headlamps DRL for GMC Forward Control P1996 3500

List of elements for Headlight Wiring Diagram, Motor Home Chassis with Single Headlamps DRL for GMC Forward Control P1996 3500:

• (provision for fog lamps)
• 1996 vftc c
• 87a
• Accy
• Bulb test
• Daytime running lamps (drl) module (attached to i/p harness at steering column)
• Daytime running lamps (drl) relay (on main support bracket at driver's island)
• Diode network
• Drl indicator
• Drl relay ctrl
• Fog lamps
• G106 (forward lamps harness, by right lamps breakout)
• G120 (7.4l vin j (l29)) (near breakout for generator) (7.4 vin n (l19): n0 ground point available, near breakout for chassis harness)
• G202 (under i/p)
• G202 under i/p)
• Gauges fuse 20a
• Ground
• Head
• Head- lamp dimmer switch
• Headlamps switch
• Hi beam indicator
• Hi bm feed
• Hi bm indicator
• Hot at all times
• Hot in run or start
• I/p fuse block
• Ignition
• Ignition switch
• Instrument cluster
• Instrument cluster system
• Lamp feed
• Left head- lamp
• Lock
• Off
• Park
• Park brake in
• Park brake indicator switch (on park brake)
• Pnk
• Right head- lamp
• Run
• Start
• Tan

Headlight Wiring Diagram, Motor Home Chassis without DRL for GMC Forward Control P1996 3500

List of elements for Headlight Wiring Diagram, Motor Home Chassis without DRL for GMC Forward Control P1996 3500:

• C 1995 vftc
• G112 (near breakout for left glowplugs)
• G202 (under i/p)
• Head
• Head- lamp
• Headlamps dimmer switch
• Headlamps switch
• Hi beam indicator
• Hot at all times
• Instrument cluster
• Left head- lamp hi beam (w/ dual head- lamps)
• Left hi head- lamp
• Off
• Park
• Right head- lamp hi beam (w/ dual head- lamps)
• Right lo
• Tan

HORN

Horn Wiring Diagram for GMC Forward Control P1996 3500

List of elements for Horn Wiring Diagram for GMC Forward Control P1996 3500:

• (behind right headlamp)
• (left interior bulkhead) (commercial)
• (on driver's island) (motorhome)
• C 1995 vftc
• G107
• Horn relay
• Horn switch
• Horn/dm fuse 20a
• Hot at all times
• I/p fuse block
• Left horn (body builder installed)
• Right horn (body builder installed)
• Steering wheel

INSTRUMENT CLUSTER

Instrument Cluster Wiring Diagram, Commercial Chassis for GMC Forward Control P1996 3500

List of elements for Instrument Cluster Wiring Diagram, Commercial Chassis for GMC Forward Control P1996 3500:

• (diesel a/t: rear of left
• (gasoline a/t: thermostat
• (m/t) (a/t)
• (m/t: on generator
• (on left bulkhead)
• (w/ m/t) (diesel w/ a/t) (gasoline w/ a/t)
• 1.5k
• 150 (m/t)
• 450 (a/t)
• Acc
• Batt
• Bracket)
• Brake pressure differential switch switch (left frame rail behind radiator)
• Coolant temperature gauge
• Cylinder head)
• Daytime running lamps control module (near steering column)
• Daytime running lights ind. (w/ drl)
• Diesel
• Ecm-1 fuse 20a
• Eng-1 fuse 20a
• Engine controls system (diesel only)
• Engine controls system (gasoline only)
• Engine coolant level switch (diesel only) (lower left end of surge tank)
• Engine coolant temperature gauge sender (left side of engine)
• Engine oil pressure gauge sender (top left rear of engine)
• Exterior lights system
• Fasten belts ind.
• Fuel gauge
• Fuel pump switch & engine oil pressure gauge sensor (top left rear of engine)
• Fuel sender & fuel pump (top of fuel tank)
• Fuel sender (top of fuel tank)
• G119 g114 (m/t: generator bracket) (a/t: rear of left
• G119 g114 g125
• G125 (thermostat housing)
• G202
• G202 (on left bulkhead)
• Gasoline
• Gauges fuse 20a
• Glow plugs ind. (diesel)
• Gnd
• Headlights system
• Headlights system (w/ drl)
• Hi beam ind.
• Horn dm fuse 20a
• Hot at all times
• Hot in run or start
• Housing)
• I/p fuse block
• I/p fuse panel
• I/p fuse panel: ecm-1 fuse
• Ign
• Ign feed
• Ignition switch
• Illumination lamps
• Ind ctrl
• Inline diode d200 left side of i/p)
• Inline diode d201 left side of i/p)
• Instrument cluster
• Interior lights system
• Left turn ind.
• Lock
• Low coolant ind. (diesel)
• Low flow
• Low pres.
• Nca
• Off
• Oil pressure gauge
• P/b booster fluid flow & pressure alarm
• P/b booster fluid flow indicator/ alarm delay module
• P/b booster fluid flow indicator/ alarm switch
• P/b booster pump pressure switch
• Park brake in
• Park brake ind.
• Park brake indicator switch (park brake support bracket)
• Pnk
• Pnk a
• Resistor r200 (near i/p fuse block)
• Right turn ind.
• Service brake ind.
• Service engine soon ind.
• Service transmission ind. (diesel)
• Speedometer
• Start
• Sw sense
• Tan
• Tan/
• Transmission control module (left bulkhead)
• Transmissions system
• Twisted pair
• Vehicle control module (on left radiator support)
• Vehicle speed sensor (left rear of transmission)
• Vehicle speed sensor buffer
• Vehicle speed sensor buffer (diesel only) (behind left side of i/p)
• Vehicle speed sig
• Voltmeter
• Vss out
• Vss rtn
• Vss sig
• W/ a/t only
• W/ drl
• W/ uj1
• Warning system
• Water in fuel ind. (diesel)
• Water-in-fuel sensor (diesel only) (rear of intake manifold)

Instrument Cluster Wiring Diagram, Motor Home Chassis (1 of 2) for GMC Forward Control P1996 3500

List of elements for Instrument Cluster Wiring Diagram, Motor Home Chassis (1 of 2) for GMC Forward Control P1996 3500:

• (5 bulbs)
• (body builder installed)
• (l19 only)
• (l19/l65)
• (l65 only)
• (l65) (l19)
• (under left side of i/p)
• Acc
• Auto park ind.
• Brake pressure differential switch switch (left frame rail behind radiator)
• Coolant temperature gauge
• Daytime running lamps control module (near steering column)
• Daytime running lights ind. (w/ drl)
• Diesel
• Diode network
• Ecm-1 fuse 20a
• Eng-1 fuse 20a
• Engine controls system
• Engine controls system (diesel only)
• Engine coolant level switch (diesel only) (lower left end of surge tank)
• Engine oil pressure gauge sender (top left rear of engine)
• Exterior lights system
• Fasten belts ind.
• From i/p fuse panel: ecm-1 fuse
• Fuel gauge
• Fuel pump switch & engine oil pressure gauge sensor (front left side of engine)
• G202
• G202 (under left side of i/p)
• Gages fuse 20a
• Gasoline
• Glow plugs ind. (diesel)
• Gnd
• Headlights system
• Headlights system (w/ drl)
• Hi beam ind.
• Hot in run
• Hot in run or start
• I/p fuse block
• Ign
• Ign feed
• Ignition switch
• Illumination lamps
• Ind ctrl
• Instrument cluster
• Interior lights system
• L19 & l65
• L19/165
• L29
• Left turn ind.
• Lock
• Low coolant ind. (diesel)
• Off
• Oil pressure gauge
• Park brake in
• Park brake ind.
• Park brake indicator switch (park brake bracket support)
• Pnk
• Pnk a to vehicle speed sensor buffer
• Provision for body builder
• Red
• Right turn ind.
• Service brake ind.
• Service engine soon ind.
• Service throttle soon ind. (diesel)
• Speedometer
• Start
• Tan
• Tan/
• Twisted pair
• Vehicle control module (l29 only) (on left radiator support)
• Vehicle speed sensor (left rear side of transmission)
• Vehicle speed sensor buffer (l19/l65 only) (behind left side of i/p)
• Voltmeter
• Vss (hi)
• Vss (lo)
• Vss out
• Vss rtn
• Vss sig
• W/ drl
• Warning system
• Water in fuel ind. (diesel)
• Water-in-fuel sensor (diesel only) (part of fuel injection pump)

Instrument Cluster Wiring Diagram, Motor Home Chassis (2 of 2) for GMC Forward Control P1996 3500

List of elements for Instrument Cluster Wiring Diagram, Motor Home Chassis (2 of 2) for GMC Forward Control P1996 3500:

• (body builder installed)
• 1200- 1600 psi
• <450psi
• Battery junction block
• Diesel
• Diode d300
• Diode d301
• Engine coolant temperature gauge sender (front of engine)
• Fuel level sender (top of fuel tank)
• Fuel senser & fuel pump (top of fuel tank)
• Gasoline
• Hot at all times
• Hot in run
• I/p auxiliary fuse block
• Park
• Park brake low pressure switch (on right frame rail behind transmission)
• Park brake pressure valve solenoid
• Park brake pump motor (on right frame rail behind transmission)
• Park brake pump motor relay (on right frame rail behind transmission)
• Park brake pump motor switch (on right frame rail behind transmission)
• Pnk
• Red

INTERIOR LIGHTS

Interior Light Wiring Diagram, Commercial Chassis for GMC Forward Control P1996 3500

List of elements for Interior Light Wiring Diagram, Commercial Chassis for GMC Forward Control P1996 3500:

• (5)
• Dim
• Dome lamp switch
• Exterior lights system
• G119 (diesel m/t) g114 (others)
• Head
• Headlamps switch
• High
• Horn dim fuse 20a
• Hot at all times
• I/p fuse block
• I/p lamps dimmer switch
• Instr lps fuse 5a
• Instrument cluster
• Light switch
• Off
• Panel lamps switch
• Park
• Prndl lamp
• Provision for dome lamp
• Steering column
• Steering column on lower mounting stud of headlamps dimmer switch
• Tail lps fuse 20a

Interior Light Wiring Diagram, Motor Home Chassis for GMC Forward Control P1996 3500

List of elements for Interior Light Wiring Diagram, Motor Home Chassis for GMC Forward Control P1996 3500:

• (6)
• (left side of i/p)
• Dim
• Dome lamp switch
• Exterior lights system
• G202
• Head
• Headlight switch
• High
• Horn dim fuse 20a
• Hot at all times
• I/p fuse block
• Instr lps fuse 5a
• Instrument cluster
• Instrument panel dimmer switch
• Light switch
• Off
• Panel lamps switch
• Park
• Provision for dome lamp
• Tail lps fuse 20a
• Transmission range indicator lamp

POWER DISTRIBUTION

Power Distribution Wiring Diagram, Commercial Chassis (1 of 5) for GMC Forward Control P1996 3500

List of elements for Power Distribution Wiring Diagram, Commercial Chassis (1 of 5) for GMC Forward Control P1996 3500:

• (124 a)
• (124 a) red
• (base)
• 1996 vftc c
• A/c compressor clutch relay
• A12
• Accessory junction block (left interior bulkhead, near relay bracket) (w/deluxe school bus (b3m) only)
• Auxiliary engine coolant fan relay (diesel only)
• B b8
• B c8
• B stud
• Batt bus
• Battery
• Battery junction block (left side of engine bulkhead, above relay bracket)
• Data link connector (dlc)
• Diesel
• Dome lamp (provisions for)
• E2 ecm- bat fuse 20a
• Eng- bat fuse 15a
• F7 tail lps fuse 20a
• Fuel pump relay
• Fuel pump switch & engine oil pressure gauge sensor
• Fusible link 10 ga. rust
• Fusible link 18 ga. rust
• G7 stop- haz fuse 15a
• Gas
• Generator (right front of engine)
• Glow plug control switch (diesel only)
• Hazard warning lamps flasher
• Headlamps switch
• Horn relay
• Horn/ dm fuse 20a
• I/p fuse block (dash panel provided by body builder) (body builder installed)
• Ignition switch
• P b2
• P c2
• Pwr bus
• Pwr fuse 30a
• Red
• Remote battery access terminal block (rear of right radiator core support panel)
• S128
• S129
• Seat belt alarm
• Secondary battery (diesel only)
• Starter relay
• Starter solenoid (at starter, lower right side of engine)
• Stud
• To headlamps switch (cavity e)
• Torque converter clutch & stoplamps switch
• Transmission control module (a/t only)
• Vehicle control module (vcm)
• W/deluxe school bus (b3m) only

Power Distribution Wiring Diagram, Commercial Chassis (2 of 5) for GMC Forward Control P1996 3500

List of elements for Power Distribution Wiring Diagram, Commercial Chassis (2 of 5) for GMC Forward Control P1996 3500:

• 10a
• 1996 vftc c
• A a6
• A b6
• A c6
• Acc
• Acc bus
• Acc e5
• Automatic transmission
• Automatic transmission (at)
• Auxiliary engine coolant fan relay
• Camshaft position (cmp) sensor
• Clutch pedal position (cpp) switch
• Crank fuse (engine harness, in-line fuse block near right side of steering column upper support)
• Crk (start)
• Diesel
• Eng-1 fuse 20a
• Evaporative emissions (evap) canister purge solenoid valve
• Fuel heater
• Fuel injection pump cold advance solenoid engine coolant temperature (ect) switch
• Fuse output- accessory type 3 fuse
• Gas
• Gauges fuse, ecm-1 fuse: (4.3l vin w (l35) engine) (5.7l vin r (l31) engine) (6.5l vin y (l57) engine)
• Glow plug control switch
• Heated oxygen sensor (ho2s) left pre- converter
• Heated oxygen sensor (ho2s) post converter (4.3l vin w (l35) engine) heated oxygen sensor (ho2s) left post converter (5.7l vin r (l31) engine)
• Heated oxygen sensor (ho2s) right post converter (5.7l vin r (l31) engine)
• Heated oxygen sensor (ho2s) right pre- converter
• I/p fuse block (dash panel provided by body builder) (body builder installed)
• Ignition switch
• Linear exhaust gas recirc- ulation (egr) solenoid valve
• Lock
• Manual transmission
• Mass air flow (maf) sensor
• Nca
• Off
• On (run)
• Park/neutral position (pnp) & backup lamps switch
• Pnk
• Provisions for wiper/ washer motor
• Radio fuse 10a
• Red
• To i/p fuse block: (aux, i-3, turn b/u, & htr fuses)
• Trans fuse 10a
• Vehicle control module (vcm)
• Water- in-fuel sensor
• Windshield wiper & washer switch
• Wiper fuse 25a

Power Distribution Wiring Diagram, Commercial Chassis (3 of 5) for GMC Forward Control P1996 3500

List of elements for Power Distribution Wiring Diagram, Commercial Chassis (3 of 5) for GMC Forward Control P1996 3500:

• 1996 vftc c
• 4.3l vin w (l35) engine
• 5.7l vin r (l31) engine
• Crankshaft position (ckp) sensor
• Crankshaft position sensor (ckp)
• Ecm-1 fuse 20a
• Electronic ignition (ei) coil driver module
• Fuel injector no.1
• Fuel injector no.2
• Fuel injector no.3
• Fuel injector no.4
• Fuel injector no.5
• Fuel injector no.6
• Fuel injector no.7
• Fuel injector no.8
• Hot in run & start
• I/p fuse block (dash panel provided by body builder) (body builder installed)
• Ignition coil
• Instrument cluster
• Pnk
• Vehicle control module (vcm)

Power Distribution Wiring Diagram, Commercial Chassis (4 of 5) for GMC Forward Control P1996 3500

List of elements for Power Distribution Wiring Diagram, Commercial Chassis (4 of 5) for GMC Forward Control P1996 3500:

• 124 a
• 1996 vftc c
• 6.5l vin y (l57) engine
• A/c compressor clutch relay
• Automatic transmission
• Back up lamps switch
• Base
• C16
• C208
• Canadian models only
• D4 htr fuse 25a d3
• Daytime running lamp (drl) relay
• Daytime running lamps (drl) control module
• Diesel
• E4 turn- b/u fuse e3 15a
• Ecm-1 fuse 20a
• F4 i-3 fuse 15a f3
• F6 gauges fuse 20a f5
• From ignition switch (conn. c2, cavity a)
• Fuel injection pump fuel shut-off solenoid
• G4 aux fuse 30a g3
• Gas
• Gas models only
• Generator
• Hot in run & start
• Htr bus
• I/p fuse block (dash panel provided by body builder) (body builder installed)
• Ign bus
• Instrument cluster
• Manual transmission
• P/b booster fluid flow & pressure alarm
• Park/ neutral position (pnp) & backup lamps switch
• Pnk
• Seat belt alarm
• This can plug into c4, b4, or a4
• Torque converter clutch (tcc) & stop lamps switch
• Transmission control module (tcm)
• Turn signal flasher
• Vehicle control module (vcm)
• Vehicle speed sensor (vss) buffer
• W/brake warning indicator system only (uj1)

Power Distribution Wiring Diagram, Commercial Chassis (5 of 5) for GMC Forward Control P1996 3500

List of elements for Power Distribution Wiring Diagram, Commercial Chassis (5 of 5) for GMC Forward Control P1996 3500:

• 1996 vftc c
• 7.20 +/- 1.20 ohms
• C205
• Dash lamps input
• From i/p fuse block (tail lamps fuse)
• Head
• Headlamps switch
• I/p fuse block (dash panel provided by body builder) (body builder installed)
• I/p lamps dimmer switch
• Instr- h4
• Instrument cluster
• License lamps, left rear
• License lamps, right rear
• Lps fuse 5a
• Marker lamps (provisions for)
• Off
• Panel illumination
• Panel lamps switch
• Park
• Park & turn signal (t/s) lamp left front
• Park & turn signal (t/s) lamp right front
• Prndl lamp
• Seat belt alarm
• Side marker lamp left front
• Side marker lamp right front
• Side marker lamp, left rear (provisions for)
• Side marker lamp, right rear (provisions for)
• Tail
• Tail & stop/turn signal lamps left (provisions for)
• Tail & stop/turn signal lamps right (provisions for)

Power Distribution Wiring Diagram, Motor Home Chassis (1 of 5) for GMC Forward Control P1996 3500

List of elements for Power Distribution Wiring Diagram, Motor Home Chassis (1 of 5) for GMC Forward Control P1996 3500:

• 1996 vftc c
• 6.5l vin f (l65) engine
• 6.5l vin f (l65) engine only
• 7.4l vin j (l29) & 6.5l vin f (l65) engines only
• 7.4l vin j (l29) engine
• 7.4l vin n (l19) engine
• A/c compressor control relay
• Bat
• Battery
• Battery junction block (on forward left side of the bulkhead)
• Blank fuse
• Buss bar
• C13
• D13
• Data link connector (dlc)
• Diesel only
• Dome lamp
• E16
• E2 ecm- bat fuse 20a
• Eng- bat fuse 15a
• F7 tail lamps fuse 20a
• Fan control relay
• Fuel pump & oil pressure indicator switch (7.4l vin n & 6.5l vin f engines) fuel pump/ oil pressure switch (7.4l vin j engine)
• Fuel pump relay
• Fusible link 10 ga. rust
• G7 stop- haz fuse 15a
• Generator (on right front of engine)
• Glow plug control relay
• Hazard lamps flasher
• Headlamps switch
• Horn relay
• Horn/ dm fuse 20a
• I/p fuse block (mounted on the i/p)
• Ignition switch
• Powertrain control module (pcm)
• Pwr circuit breaker 30a
• Red
• S107
• S108
• Seat belts/ lamps alarm module
• Secondary battery (diesel only)
• Starter motor (on right rear side of engine)
• Starter relay
• To headlamps switch (cavity e)
• Torque converter clutch (tcc) & stoplamps switch
• Vehicle control module (vcm)

Power Distribution Wiring Diagram, Motor Home Chassis (2 of 5) for GMC Forward Control P1996 3500

List of elements for Power Distribution Wiring Diagram, Motor Home Chassis (2 of 5) for GMC Forward Control P1996 3500:

• 1996 vftc c
• 7.4l vin j & 6.5l vin f engines
• 7.4l vin j (l29) engine
• 7.4l vin j (l29) engine & 7.4l vin n (l19) engine
• A6 crank fuse 10a
• Acc
• Acc e5
• Automatic transmission
• Camshaft position sensor (7.4l vin j (l29) engine)
• Ecm-1 fuse, & gauges fuse
• Eng-1 fuse 20a
• Evaporative emissions canister purge solenoid (7.4l vin j (l29) engine)
• Fan control relay
• Fuel heater (6.5l vin f engine)
• Fuse output accessory type 3 fuse
• Glow plug control relay (6.5l vin f engine)
• Heated oxygen sensor no.1
• Heated oxygen sensor no.2
• Heated oxygen sensor no.3
• Heated oxygen sensor no.4
• I/p auxiliary fuse block (mounted on i/p fuse block)
• I/p fuse block (mounted on the i/p)
• Ignition coil (7.4l vin n engine)
• Ignition switch
• Linear egr solenoid valve
• Lock
• Mass air flow sensor (7.4l vin j engine)
• Nca
• Off
• Park/neutral position (pnp) & backup lamps switch (7.4l vin j, & 6.5l vin f engines)
• Pnk
• Provisions for wiper/washer motor
• Radio fuse 10a
• Red
• Run
• Start
• Starter solenoid (7.4l vin n engine)
• Trans fuse 10a
• Vehicle control module
• Water in-fuel indicator sensor (6.5l vin f engine)
• Wiper fuse 25a

Power Distribution Wiring Diagram, Motor Home Chassis (3 of 5) for GMC Forward Control P1996 3500

List of elements for Power Distribution Wiring Diagram, Motor Home Chassis (3 of 5) for GMC Forward Control P1996 3500:

• (l19)
• (l65)
• 1996 vftc c
• 7.4l vin j (l29) engine
• 7.4l vin n (l19) & 6.5l vin f (l65) engines
• 7.4l vin n (l19) engine only
• C11
• C12
• Crankshaft position sensor
• E15
• Ecm-1 fuse 20a
• F15
• Hot in run & start
• I/p fuse block (mounted on the i/p)
• Ignition coil
• Ignition coil driver
• Injector no.1
• Injector no.2
• Injector no.3
• Injector no.4
• Injector no.5
• Injector no.6
• Injector no.7
• Injector no.8
• Instrument cluster
• Pnk
• Powertrain control module (pcm)
• Vehicle control module (vcm)
• Vehicle speed sensor buffer

Power Distribution Wiring Diagram, Motor Home Chassis (4 of 5) for GMC Forward Control P1996 3500

List of elements for Power Distribution Wiring Diagram, Motor Home Chassis (4 of 5) for GMC Forward Control P1996 3500:

• 1996 vftc c
• 6.5l vin f (l65) engine only
• 7.4l vin j & 6.5l vin f (l65) engines only
• 7.4l vin j (l29) engine
• 7.4l vin j (l29) & 6.5l vin f (l65) engines
• 7.4l vin n (l19) & 7.4l vin j (l29) engines
• 7.4l vin n (l19) engine
• A/c compressor control relay
• Aux circuit breaker 30a
• Backup lamp switch
• Buss bar
• Canadian models
• Cruise control module
• D4 htr fuse 25a d3
• Daytime running lamps module
• Daytime running lamps relay
• E4 turn b/u fuse e3 15a
• F4 i-3 fuse 15a f3
• F6 gauges fuse 20a f5
• From ignition switch (conn. c2, cavity a)
• Generator
• Hot in run & start
• I/p auxiliary fuse block (mounted on the i/p fuse block)
• I/p fuse block (mounted on the i/p)
• I/p fuse block (mounted on the i/p)
• Instrument cluster
• Nca
• Park brake low pressure switch
• Park/neutral position (pnp) & backup lamp switch
• Pnk
• Seatbelts/ lamps alarm module
• Speed control switch
• Torque converter clutch & stoplamps switch
• Turbo charger power valve solenoid
• Turn signal flasher
• Turn signal switch
• Vehicle control module (vcm)

Power Distribution Wiring Diagram, Motor Home Chassis (5 of 5) for GMC Forward Control P1996 3500

List of elements for Power Distribution Wiring Diagram, Motor Home Chassis (5 of 5) for GMC Forward Control P1996 3500:

• 1996 vftc c
• From i/p fuse block (tail lamps fuse)
• Full dim
• Head
• Headlamps switch
• High
• I/p fuse block (mounted on the i/p)
• I/p fuse block (mounted on i/p)
• Instr- h4
• Instrument cluster
• Instrument panel dimmer switch
• Lamp on input
• License lamp, left rear (provisions for)
• License lamp, right rear (provisions for)
• Light switch
• Lps fuse 5a
• Off
• Panel illumination
• Panel lamps
• Park
• Park & turn signal (t/s) lamp, left front
• Park & turn signal (t/s) lamp, right front
• Roof marker lamps (provisions for)
• Seatbelts/ lamps alarm module
• Side marker lamp left front (provisions for)
• Side marker lamp right front (provisions for)
• Side marker lamp, left rear (provisions for)
• Side marker lamp, right rear (provisions for)
• Tail, stop, turn signal (t/s) lamps, left (provisions for)
• Tail, stop, turn signal (t/s) lamps, right (provisions for)
• Transmission range indicator lamp

SHIFT INTERLOCKS

Shift Interlock Wiring Diagram, Commercial Chassis for GMC Forward Control P1996 3500

List of elements for Shift Interlock Wiring Diagram, Commercial Chassis for GMC Forward Control P1996 3500:

• (left interior bulkhead on relay bracket)
• (left interior bulkhead, near relay bracket or body builder installed)
• Brake/transmission shift interlock solenoid (on steering column)
• Brake/transmission shift interlock relay
• C 1995 vftc
• Diesel
• G200
• Gasoline
• Hot in run
• I-3 fuse 15a
• I/p fuse block
• Park/neutral position and backup lamps switch (left of transmission)
• Torque converter clutch and stop lamps switch (right side of steering column) c1
• Trans- mission control module (left interior bulkhead)
• Turn b/u fuse 15a
• Turn signal flasher (on fuse block)
• Vehicle control module (left radiator support)

Shift Interlock Wiring Diagram, Motor Home Chassis for GMC Forward Control P1996 3500

List of elements for Shift Interlock Wiring Diagram, Motor Home Chassis for GMC Forward Control P1996 3500:

• (below left side of i/p)
• (top of support bracket at driver's island)
• (vin f)
• (vin l)
• Brake/transmission shift interlock solenoid (on steering column)
• Brake/transmission shift interlock relay
• C 1995 vftc
• E13
• G202
• Hot in run
• I-3 fuse 15a
• I/p fuse block
• Park/neutral position and backup lamps switch (left of transmission)
• Power- train control module (left interior bulkhead)
• Torque converter clutch and stop lamps switch (right side of steering column)
• Turn b/u fuse 15a
• Turn signal flasher (on fuse block)
• Vehicle control module (left radiator support)
• Vin j
• Vin l, vin f

STARTING/CHARGING

Charging Wiring Diagram for GMC Forward Control P1996 3500

List of elements for Charging Wiring Diagram for GMC Forward Control P1996 3500:

• (rear of right cylinder head)
• Battery
• Fusible link (10 ga-rust)
• G117
• Gauges fuse 20a
• Generator
• Hot in run and start
• I/p fuse block
• Pnk
• Power distribution system
• Red
• Secondary battery (diesel)
• Starter solenoid or starter solenoid interconnect

Starting Wiring Diagram for GMC Forward Control P1996 3500

List of elements for Starting Wiring Diagram for GMC Forward Control P1996 3500:

• (ex. l19)
• (left interior bulkhead near relay bracket-commercial chassis diesel, rear of left cyl. head-commercial chassis gasoline, 13 cm from breakout for the ignition coil-motor home vin j)
• (rear of right cylinder head)
• A/t
• Accy
• Battery
• Battery junction block
• Clutch pedal position switch (clutch pedal bracket)
• Engine controls system (commercial diesel)
• Fusible link (10 ga-rust)
• G117
• G202 (commercial chassis-diesel) g114 (commercial chassis-gasoline) g117 (motor home-vin j)
• Hold- in coil
• Ignition switch
• In-line crank fuse 10a (near steering column)
• L19 only
• Lock
• M/t
• Off
• Park/neutral position and backup lamps switch (left side of transmission)
• Pull- in coil
• Red
• Red b
• Run
• Secondary battery (diesel)
• Start
• Starter motor
• Starter relay (under battery junction block)
• Starter solenoid

TRANSMISSION

4.3L

4.3L (VIN W), Transmission Wiring Diagram for GMC Forward Control P1996 3500

List of elements for 4.3L (VIN W), Transmission Wiring Diagram for GMC Forward Control P1996 3500:

• 1-2 shift
• 1-2 shift sol
• 2-3 shift sol
• 2-3 shift solenoid
• 5v reference
• A/t iss hi in
• A/t iss lo in
• Auto transmission input shaft speed sensor (inside front of transmission)
• Automatic transmission
• Battery in
• Brake switch input
• Data class ii
• Data link connector
• Ecm batt fuse 20a
• Ecm i fuse 20a
• Ect sens input
• Eng 1 fuse 20a
• Engine coolant temp sensor (top front of engine)
• G131 (intake mainfold, on thermostat housing)
• Gauges fuse 20a
• Hot at all times
• Hot in run
• Hot in run or start
• I/p fuse block
• I3 fuse 15a
• Ignition in
• Instrument cluster
• Malfunction indicator lamp
• Mil control
• Pcm ground
• Pcs sol hi out
• Pcs sol lo out
• Pnk
• Press ctrl
• Range signal "a"
• Range signal "b"
• Range signal "c"
• Red
• S108
• S116
• S119 (engine harness, 11 cm from ect-a/c clutch break-out)
• S133
• S134
• S143
• S200 (engine harness, i/p side near ignition switch)
• S202
• Sensor ground
• Sensor return
• Solenoid
• Tcc pwm
• Tcc pwm sol
• Tcc/stop- lamp switch (on brake pedal bracket)
• Throttle position sensor (mounted to side of throttle body)
• Tp sens input
• Trans fluid temp sensor
• Trans fuse 10a
• Trans range pressure switch assembly
• Trans temp sig in
• Vehicle control module (vcm) (behind left headlight)
• Vehicle speed sensor (left rear of transmission)
• Vss hi
• Vss lo

5.7L

5.7L (VIN R), Transmission Wiring Diagram for GMC Forward Control P1996 3500

List of elements for 5.7L (VIN R), Transmission Wiring Diagram for GMC Forward Control P1996 3500:

• 1-2 shift
• 1-2 shift sol
• 2-3 shift sol
• 2-3 shift solenoid
• 5v reference
• A/t iss hi in
• A/t iss lo in
• Auto transmission input shaft speed sensor (inside front of transmission)
• Automatic transmission
• Battery in
• Brake switch input
• Data class ii
• Data link connector
• Ecm batt fuse 20a
• Ecm i fuse 20a
• Ect sens input
• Eng 1 fuse 20a
• Engine coolant temp sensor (top front of engine)
• G131 (intake mainfold, on thermostat housing)
• Gauges fuse 20a
• Hot at all times
• Hot in run
• Hot in run or start
• I/p fuse block
• I3 fuse 15a
• Ignition in
• Instrument cluster
• Malfunction indicator lamp
• Mil control
• Pcm ground
• Pcs sol hi out
• Pcs sol lo out
• Pnk
• Press ctrl
• Range signal "a"
• Range signal "b"
• Range signal "c"
• Red
• S108
• S116
• S119 (engine harness, 11 cm from ect-a/c clutch break-out)
• S133
• S134
• S143
• S200 (engine harness, i/p side near ignition switch)
• S202
• Sensor ground
• Sensor return
• Solenoid
• Tcc pwm
• Tcc pwm sol
• Tcc/stop- lamp switch (on brake pedal bracket)
• Throttle position sensor (mounted to side of throttle body)
• Tp sens input
• Trans fluid temp sensor
• Trans fuse 10a
• Trans range pressure switch assembly
• Trans temp sig in
• Vehicle control module (vcm) (behind left headlight)
• Vehicle speed sensor (left rear of transmission)
• Vss hi
• Vss lo

6.5L

6.5L (VIN F), Transmission Wiring Diagram for GMC Forward Control P1996 3500

List of elements for 6.5L (VIN F), Transmission Wiring Diagram for GMC Forward Control P1996 3500:

• (engine harn, 2 cm from wiper motor break-out)
• 1-2 shift
• 1-2 shift sol
• 2-3 shift sol
• 2-3 shift solenoid
• 3-2 shift
• 3-2 shift sol
• A/t iss sens hi in
• A/t iss sens lo in
• A12
• Accelerator pedal position (app) module (throttle pedal mount)
• App 1 5v ref
• App 1 signal in
• App 2 5v ref
• App 2 signal in
• App 3 5v ref
• App 3 signal in
• Auto transmission input shaft speed sensor (inside front of transmission)
• Automatic transmission
• B10
• B12
• Battery in
• Brake switch assembly (on brake pedal bracket)
• Brake switch in
• C11
• C12
• C13
• C14
• C15
• Class ii data
• D11
• D12
• D13
• Data link connector
• Ecm batt fuse 20a
• Ecm i fuse 20a
• Ect sensor in
• Engine coolant temp sensor (left lower front of engine)
• Gauges fuse 20a
• Hot at all times
• Hot in run
• Hot in run or start
• I 3 fuse 15a
• I/p fuse block
• Ignition in
• Instrument cluster
• Malfunction indicator lamp
• Mil control
• Pcm ground
• Pcs sol hi out
• Pcs sol lo out
• Pnk
• Powertrain control module (engine compt, top of radiator support)
• Press ctrl
• Red
• S114
• S115
• S116
• S119 (engine harn, 4 cm from glow plug controller break-out)
• S121
• S124 (engine harn, 16 cm from p100)
• S126
• S200 (i/p harn, 8 cm from steering column break-out)
• Sensor ground
• Solenoid
• Stop/haz fuse 15a
• Stoplamp switch in
• Tft sensor in
• Trans fluid temp sensor
• Trans fuse 10a
• Trans range "a"
• Trans range "b"
• Trans range "c"
• Trans range pressure switch assembly
• Vehicle speed sensor (left rear of transmission)
• Vehicle speed sensor (vss) buffer (above accelerator pedal)
• Vss hi in
• Vss lo in
• Vss out

6.5L (VIN Y), Transmission Wiring Diagram for GMC Forward Control P1996 3500

List of elements for 6.5L (VIN Y), Transmission Wiring Diagram for GMC Forward Control P1996 3500:

• (engine harn, 6 cm from glow plug switch break-out) s119
• 1-2 shift sol
• 1-2 shift sol ctrl
• 2-3 shift sol
• 2-3 shift sol ctrl
• 5 volts ref
• A12
• B10
• Battery feed
• Brake signal
• C15
• C16
• D13
• D16
• Data link connector
• Diagnostic test
• Ecm bat fuse 20a
• Ecm-i fuse 20a
• Engine speed sensor (top center of engine)
• Engine speed signal
• G114 (rear of left cylinder head)
• Hot at all times
• Hot in run
• Hot in run or start
• I 3 fuse 15a
• I/p fuse block
• Ignition
• Input speed sens hi
• Input speed sens lo
• Instrument cluster
• Pcs hi
• Pcs lo
• Pnk
• Pnk n
• Pressure control solenoid
• Range mode selector
• Range signal a
• Range signal b
• Range signal c
• Red
• Red p
• S108
• S111 (engine harn, 16 cm from generator break-out)
• S143
• S200 (engine harn, i/p side near ignition switch)
• Sensor ground
• Serial data
• Service trans output
• Service transmission indicator
• System ground
• Tan
• Tcc pwm control
• Tcc sol
• Tcc/brake switch (brake pedal bracket)
• Throttle position sensor (right side of throttle body)
• Tp sensor input
• Trans fluid temp sig
• Trans fuse 10a
• Trans- mission temp sensor
• Transmission
• Transmission control module (tcm) (left side of driver's island)
• Transmission input shaft speed sensor (left front side of transmission)
• Vehicle spd output
• Vehicle speed input
• Vehicle speed sensor (rear of transmission)
• Vehicle speed sensor buffer
• Vss inputs

7.4L

7.4L (VIN J), Transmission Wiring Diagram for GMC Forward Control P1996 3500

List of elements for 7.4L (VIN J), Transmission Wiring Diagram for GMC Forward Control P1996 3500:

• 1-2 shift
• 1-2 shift sol
• 2-3 shift sol
• 2-3 shift solenoid
• 5v reference
• A/t iss hi in
• A/t iss lo in
• Auto transmission input shaft speed sensor (inside front of transmission)
• Automatic transmission
• Battery in
• Brake switch input
• Data class ii
• Data link connector
• Ecm batt fuse 20a
• Ecm i fuse 20a
• Ect sens input
• Eng 1 fuse 20a
• Engine coolant temp sensor (top front of engine)
• G131 (intake mainfold, on thermostat housing)
• Gauges fuse 20a
• Hot at all times
• Hot in run
• Hot in run or start
• I/p fuse block
• I3 fuse 15a
• Ignition in
• Instrument cluster
• Malfunction indicator lamp
• Mil control
• Pcm ground
• Pcs sol hi out
• Pcs sol lo out
• Pnk
• Press ctrl
• Range signal "a"
• Range signal "b"
• Range signal "c"
• Red
• S108
• S116
• S119 (engine harness, 11 cm from ect-a/c clutch break-out)
• S133
• S134
• S143
• S200 (engine harness, i/p side near ignition switch)
• S202
• Sensor ground
• Sensor return
• Solenoid
• Tcc pwm
• Tcc pwm sol
• Tcc/stop- lamp switch (on brake pedal bracket)
• Throttle position sensor (mounted to side of throttle body)
• Tp sens input
• Trans fluid temp sensor
• Trans fuse 10a
• Trans range pressure switch assembly
• Trans temp sig in
• Vehicle control module (vcm) (behind left headlight)
• Vehicle speed sensor (left rear of transmission)
• Vss hi
• Vss lo

7.4L (VIN N), Transmission Wiring Diagram for GMC Forward Control P1996 3500

List of elements for 7.4L (VIN N), Transmission Wiring Diagram for GMC Forward Control P1996 3500:

• (engine harn, 24 cm from cruise control break-out) s127
• (engine harness, 4 cm from engine cooling fan harness breakout)
• (left side of driver's island)
• 1-2 shift sol
• 1-2 shift sol ctrl
• 2-3 shift sol
• 2-3 shift sol ctrl
• 5v reference
• A1 a1
• A14
• A15
• All times
• Battery feed
• Brake sig
• Data link connector
• Diagnostic test
• E11
• E13
• E15
• E16
• Ecm i fuse 20a
• Ecm-bat fuse 20a
• Ect sig
• Engine coolant temperature (ect) sensor (top front of engine)
• F10
• F12
• F13
• F14
• F15
• Gauges fuse 20a
• Hot at
• Hot in
• Hot in run
• Hot in run or start
• Hot in run, bulb
• I-3 fuse 15a
• I/p fuse block
• Ignition feed
• Instrument cluster
• Mil control
• Or start
• Pcm ground
• Pnk
• Powertrain control module (pcm)
• Pressure control hi
• Pressure control lo
• Pressure control solenoid
• Range mode selector
• Range signal "a"
• Range signal "b"
• Range signal "c"
• Red
• Run
• S114
• S116
• S118
• S121
• S126
• S154
• S200 (i/p harness, under instrument cluster)
• Sensor ground
• Serial data
• Service engine soon indic
• Speed sensor (left rear side of transmission)
• Tan
• Tcc
• Tcc pwm sol
• Tcc/brake switch (on brake pedal bracket)
• Test or start
• Throttle position sensor (on side of throttle body)
• Tp signal
• Trans fluid temp (tft) sensor
• Trans fluid temp sig
• Trans fuse 10a
• Trans input speed
• Transmission
• Transmission input shaft speed sensor (front of transmission)
• Vehicle speed sensor buffer
• Vss signal hi in
• Vss signal lo in

WARNING SYSTEMS

Warning System Wiring Diagrams, Commercial Chassis for GMC Forward Control P1996 3500

List of elements for Warning System Wiring Diagrams, Commercial Chassis for GMC Forward Control P1996 3500:

• Diesel
• Fasten belts lamp
• G114 (a/t) (rear of left cylinder head)
• G116 (left safety wall, near fuse block)
• G119 (m/t) (alternator rear mounting bracket)
• G131 (thermostat housing)
• Gas
• Gauges fuse 20a
• Ground
• Horn dm fuse 20a
• Hot at all times i/p fuse block
• Hot in park or head
• Hot in run or start
• Instrument cluster
• Instrument lps fuse 5a
• Lamps on input
• Pnk
• Power (battery)
• Power (ignition)
• Seat belt alarm (i/p fuse block)
• Seat belt input
• Seat belt lamp output

Warning System Wiring Diagrams, Motor Home Chassis for GMC Forward Control P1996 3500

List of elements for Warning System Wiring Diagrams, Motor Home Chassis for GMC Forward Control P1996 3500:

• (10 cm from alternator breakout) (18 cm from left glow plug breakout)
• (20 cm from chassis harness breakout)
• Engine (7.4l vin n)
• Fasten belts lamp
• G112 (6.5l vin f)
• G120 (7.4l vin j)
• G202 (20 cm from i/p connector breakout)
• Gauges fuse 20a
• Ground
• Horn dm fuse 20a
• Hot at all times i/p fuse block
• Hot in park or head
• Hot in run
• Instrument cluster
• Instrument lps fuse 5a
• Lamps on input
• Pnk
• Power (battery)
• Power (ignition)
• Seat belt alarm (i/p fuse block)
• Seat belt input
• Seat belt lamp output

WIPER/WASHER

Provisions For Front Wiper/Washer Wiring Diagram, Commercial Chassis for GMC Forward Control P1996 3500

List of elements for Provisions For Front Wiper/Washer Wiring Diagram, Commercial Chassis for GMC Forward Control P1996 3500:

• (1996-97) (1998-99)
• (first breakout from bulkhead connector)
• High
• Hot in accy or run
• I/p fuse block
• Low
• Mist
• Off
• Pnk
• Provisions for wiper/washer motor
• Wash
• Windshield wiper and washer switch
• Wiper fuse wiper fuse 14 25a

Provisions For Front Wiper/Washer Wiring Diagram, Motor Home Chassis for GMC Forward Control P1996 3500

List of elements for Provisions For Front Wiper/Washer Wiring Diagram, Motor Home Chassis for GMC Forward Control P1996 3500:

• (1996-97,1999) s150 (1998) s203
• (1998-99) g202 (left side of dash)
• 1996-97
• 1998/
• Delay rheo- stat
• G202 (1996-97) (on driver's island)
• High
• Hot in accy and run
• I/p fuse block
• Low
• Mist
• Off
• Pnk
• Provisions for wiper/washer motor
• Pulse
• Pulse wiper control module (strapped to harness under driver's island)
• Wash
• Wiper fuse 14 25a
• Wiper fuse 25a
• Wiper/ washer switch