POWER DISTRIBUTION – GMC Forward Control P3500 1999 – SYSTEM WIRING DIAGRAMS

POWER DISTRIBUTION

Power Distribution Wiring Diagram, Commercial Chassis (1 of 4) for GMC Forward Control P3500 1999

List of elements for Power Distribution Wiring Diagram, Commercial Chassis (1 of 4) for GMC Forward Control P3500 1999:

• (105a)
• (diesel a/t-engine harness, approx 19 cm from a/c compresssor clutch relay, others-engine harness, approx 11 cm from steering column connector breakout) s144
• (diesel-engine harness, 4-16 cm from starter motor breakout, gasoline-engine harness, 7 cm from generator jumper breakout) s112
• (i/p harness, approx 20 cm from fuse block breakout) s204
• (others)
• A/c compressor relay
• A12
• Accessory junction block (left interior bulkhead, near relay bracket)
• Auxiliary engine coolant fan relay (diesel only)
• B a8
• B b8
• Batt bus
• Battery
• Battery junction block (left side of engine bulkhead)
• C13
• D13
• Data link connector
• Diesel
• Dome lamp (provisions for)
• Ecm- bat fuse 6 20a
• Electronic brake control module
• Eng- bat fuse 10 15a
• Fuel pump relay
• Fusible link (10 ga- rust)
• Gas
• Generator
• Glow plug controller (diesel)
• Hazard lamp flasher
• Headlamps switch
• Horn relay
• Horn/ dm fuse 3 20a
• I/p fuse block (dash panel provided by body builder)
• Powertrain control module
• Pwr bus
• Pwr circuit breaker 30a
• Red
• Remote battery access terminal block (rear of right radiator core support panel)
• S134
• S206 (i/p harness, approx 12 cm before dash fuse block breakout)
• Seat belt alarm module
• Secondary battery (diesel only)
• Starter relay
• Starter solenoid
• Stop- haz fuse 11 15a
• Stud
• Tail lps fuse 7 20a
• To ignition switch (diagram 2 of 4)
• Torque converter clutch & stoplamps switch
• Transmission control module (a/t only)
• Vehicle control module
• W/deluxe school bus option

Power Distribution Wiring Diagram, Commercial Chassis (2 of 4) for GMC Forward Control P3500 1999

List of elements for Power Distribution Wiring Diagram, Commercial Chassis (2 of 4) for GMC Forward Control P3500 1999:

• (4.3l)
• (engine harness, approx 5 cm from right glowplug breakout) s116
• (engine harness, approx 18 cm from right engine breakout)
• (engine harness, approx 6 cm before mass air flow sensor breakout) s116
• (i/p harness, approx 15 cm after i/p fuse block breakout) s211
• A a6
• A b6
• A c6
• A d6
• A/t
• Acc
• Acc bus
• Acc radio fuse 4 10a
• Automatic transmission
• Auxiliary engine coolant fan relay
• Camshaft position sensor (4.3l)
• Camshaft position sensor (5.7l)
• Clutch pedal position switch
• Cold advance solenoid and engine coolant temperature switch
• Crank fuse 18 10a
• Crk (start)
• Diesel
• Eng-1 fuse 15 20a
• Engine shut-off solenoid
• Evap canister vent valve (4.3l)
• Evaporative emissions canister purge valve
• From fusible link (diagram 1 of 4)
• Fuel heater
• Fuel solenoid driver
• Gas
• Glow plug controller
• Heated oxygen sensor bank 1 sensor 1
• Heated oxygen sensor bank 1 sensor 2
• Heated oxygen sensor bank 2 sensor 1
• Heated oxygen sensor bank 2 sensor 2
• I/p fuse block (dash panel provided by body builder)
• Ignition switch
• In-line fuse block (near right side of steering column)
• Lock
• M/t
• Mass air flow sensor (4.3l/ 5.7l)
• Off
• On (run)
• Park/neutral position and backup lamps switch
• Pnk
• Provisions for windshield washer motor
• Red
• S139
• To ecm-1 fuse (diagram 3 of 4 and diagram 4 of 4)
• To i/p fuse block: (diagram 4 of 4)
• Trans fuse 17 10a
• Water- in-fuel indicator sensor
• Windshield wiper & washer switch
• Wiper fuse 14 25a

Power Distribution Wiring Diagram, Commercial Chassis (3 of 4) for GMC Forward Control P3500 1999

List of elements for Power Distribution Wiring Diagram, Commercial Chassis (3 of 4) for GMC Forward Control P3500 1999:

• (engine harness, 9cm from breakout to right oxygen sensor) s108
• (engine harness, approx 10 cm from breakout to right side of engine crossover harness) s108
• (engine harness, near ignition control module)
• 4.3l vin w
• 5.7l vin r
• Crankshaft position sensor
• Ecm-1 fuse 12 20a
• From eng-1 fuse (diagram 2 of 4)
• Fuel injector
• I/p fuse block (dash panel provided by body builder)
• Ignition coil
• Ignition control module
• Instrument cluster
• Pnk
• S145
• Vehicle control module

Power Distribution Wiring Diagram, Commercial Chassis (4 of 4) for GMC Forward Control P3500 1999

List of elements for Power Distribution Wiring Diagram, Commercial Chassis (4 of 4) for GMC Forward Control P3500 1999:

• (diesel assembly harn, near fuel heater)
• (engine harness, 8cm from vcm breakout) s133
• (engine harness, approx 19 cm pnk
• (engine harness, approx 26 cm from bulkhead grommet)
• (i/p harness, approx 40 cm before i/p fuse block breakout)
• 105a
• 1996 vftc c
• 6.5l engine
• A/c compressor relay
• A/t
• Aux circuit breaker 13 30a
• Aux fuse 30a
• Back up lamps switch
• C11
• C12
• C16
• Daytime running lamp relay
• Daytime running lamps control module
• Diesel
• Ecm-1 fuse 12 20a
• Electronic brake control module
• From breakout to steering column connector) s132
• From eng 1 fuse (diagram 2 of 4)
• From ignition switch (diagram 2 of 4)
• Fuel heater
• Fuel injection pump shut-off solenoid
• Fuel pump relay (mech)
• Gas
• Gauges fuse 8 20a
• Generator
• Glow plug controller (calif)
• Glow plug controller (federal)
• Htr bus
• Htr fuse 1 25a
• I a4
• I b4
• I c4
• I-3 fuse 9 15a
• I/p fuse block (dash panel provided by body builder)
• Ign bus
• Instrument cluster
• Instrument lamps fuse 5a
• Interior lights system
• Interior lights system (i/p lamps dimmer switch)
• M/t
• Others
• Park/ neutral position and backup lamps switch
• Pnk
• Powertrain control module (elec)
• S108
• S182
• S207
• Seat belts alarm module
• Torque converter clutch & stop lamps switch
• Transmission control module (a/t)
• Turn signal flasher
• Turn- b/u fuse 5 15a
• Vehicle control module (vcm)
• Vehicle speed sensor calibrator
• Water in fuel indicator sensor

Power Distribution Wiring Diagram, Motor Home Chassis (1 of 4) for GMC Forward Control P3500 1999

List of elements for Power Distribution Wiring Diagram, Motor Home Chassis (1 of 4) for GMC Forward Control P3500 1999:

• (7.4l vin j-engine harness, 44 cm from breakout for left wheel speed sensor, 6.5l-engine harness, 20 cm from breakout of main harness)
• (i/p harn, near bulkhead connector)
• (i/p harness, 10 cm from breakout for i/p fuse block)
• 6.5l vin f
• 7.4l
• 7.4l vin j
• A/c compressor relay
• Alternator
• Battery
• Battery junction block (on forward left side of the bulkhead)
• Buss bar
• C13
• Connector for dome lamp
• D13
• Data link connector
• Diesel
• Ecm- bat fuse 6 20a
• Electronic brake control module
• Eng- bat fuse 10 15a
• Fan control relay
• Fuel pump relay
• Fusible link (10 ga. red)
• Fusible link (10 ga. rust)
• Glow plug controller
• Hazard flasher
• Headlamps switch
• Horn relay
• Horn/ dm fuse 3 20a
• I/p fuse block (mounted on the dash)
• Ignition switch (diagram 2 of 4)
• Park brake pump motor relay
• Powertrain control module
• Pwr circuit breaker 2 30a
• Red
• Red a
• S114
• S125 (7.4l-engine harness 5 cm from breakout for egr 6.5l-engine harness, 9 cm from breakout for generator)
• S201
• S215 (i/p harness, 35 cm from i/p fuse block)
• S235
• Seatbelt and lamps alarm module
• Secondary battery (diesel only)
• Starter motor
• Starter relay
• Stop- haz fuse 11 15a
• Stoplamp switch
• Tail lamps fuse 7 20a
• Vehicle control module

Power Distribution Wiring Diagram, Motor Home Chassis (2 of 4) for GMC Forward Control P3500 1999

List of elements for Power Distribution Wiring Diagram, Motor Home Chassis (2 of 4) for GMC Forward Control P3500 1999:

• (7.4l: eng harn, 58cm from main passthrough 6.5l: eng harn, 7.5cm from a/c harn breakout)
• (engine harn, 11 cm from break- out to a/c compressor clutch)
• (engine harn, 15 cm from breakout to abs conn) pnk
• (i/p harn, 20cm from relay sockets) s207
• (i/p harn, 25cm from fuse panel) s157
• (i/p harn, 25cm from instrument cluster breakout)
• (i/p harn, 6cm from dimmer switch)
• 6.5l vin f
• 7.4l vin j
• Acc
• Acc radio fuse 4 10a
• Automatic transmission
• Camshaft position sensor
• Crank fuse 18 10a
• Daytime running lamp control module
• Diesel
• Diode network
• Eng-1 fuse 20a
• Engine coolant level switch
• Engine shut off solenoid
• Evaporative emissions canister purge valve solenoid
• Fan control relay
• From fusible link (diagram 1 of 4)
• Fuel solenoid driver
• Heated oxygen sensor bank 1 sensor 1
• Heated oxygen sensor bank 1 sensor 2
• Heated oxygen sensor bank 2 sensor 1
• Heated oxygen sensor bank 2 sensor 2
• I/p fuse block (mounted on the dash)
• Ignition switch
• Instrument cluster
• Lock
• Mass air flow sensor
• Nca
• Off
• Park brake alarm
• Park brake alarm relay
• Park brake low pressure indicator switch
• Park brake pull button relay
• Park brake pull button switch
• Park brake switch
• Park/ neutral position and backup lamps switch
• Park/neutral position and backup lamps switch
• Pnk
• Pnk a
• Pnk a1
• Pnk c
• Red
• Run
• S104
• S133
• S169
• S185 (diesel assy harn, 14 cm from oil pressure gauge sensor breakout)
• S206
• S212
• S217 (i/p harn, 18cm from i/p fuse block)
• S228 (engine harn, 28 cm from bulkhead grommet)
• Start
• To aux fuse (diagram 4 of 4)
• To gauges fuse (diagram 4 of 4)
• Trans fuse 17 10a
• Windshield
• Wiper fuse 14 25a
• Wiper motor

Power Distribution Wiring Diagram, Motor Home Chassis (3 of 4) for GMC Forward Control P3500 1999

List of elements for Power Distribution Wiring Diagram, Motor Home Chassis (3 of 4) for GMC Forward Control P3500 1999:

• (6.5l-engine harness, 16cm from bulkhead grommet) s121
• (diesel assy harness, near fuel heater)
• (engine harness, 28 cm from breakout for injectors)
• (fuel injector harness, 7 cm from breakout for injector 5) s158
• (fuel injector harness, 7 cm from breakout for injector 5) s159
• 6.5l vin f
• 7.4l vin j
• C11
• C12
• California
• Crankshaft position sensor
• Ecm-1 fuse 12 20a
• Federal
• From gauges fuse diagram 4 of 4)
• Fuel heater
• Glowplug controller
• I/p fuse block (mounted on the dash)
• Ignition coil
• Ignition control module
• Injector
• Instrument cluster
• Pnk
• Powertrain control module
• S121
• S182
• Vehicle control module
• Vehicle speed sensor calibrator
• Wastegate solenoid
• Water in fuel indicator sensor

Power Distribution Wiring Diagram, Motor Home Chassis (4 of 4) for GMC Forward Control P3500 1999

List of elements for Power Distribution Wiring Diagram, Motor Home Chassis (4 of 4) for GMC Forward Control P3500 1999:

• (7.4l-engine harness, 52 cm from breakout for map sensor, 6.5l-engine harness, 33 cm from breakout for windshield wiper switch) s116 (gas) s229 (diesel)
• (engine harness, 34cm from windshield wiper motor breakout) s115
• (i/p harness, 6 cm from breakout for dimmer switch) s211
• 1996 vftc c
• 7.4l vin j engine
• 7.4l vin j engines
• A/c compressor relay
• Aux circuit breaker 13 30a
• Buss bar
• Canadian models
• Cruise control module
• Cruise control switch
• Daytime running lamp control module
• Daytime running lamp relay
• Electronic brake control module
• From eng-1 fuse d (diagram 2 of 4)
• From ignition switch (diagram 2 of 4)
• Gauges fuse 8 20a
• Generator
• Htr fuse 1 25a
• I-3 fuse 9 15a
• I/p fuse block (mounted on the dash)
• Instr- lps fuse 16 5a
• Instrument cluster
• Interior lights system
• Interior lights system (instrument panel dimmer switch)
• Nca
• Pnk
• Seatbelt/ lamps alarm module
• To ecm 1 fuse diagram 3 of 4)
• Torque converter clutch and stop lamps switch
• Turn b/u fuse 5 15a
• Turn signal flasher
• Vehicle control module