All Wiring Diagrams for GMC Cab & Chassis C1998 3500

AIR CONDITIONING

5.0L

5.0L (VIN M), A/C Wiring Diagram for GMC Cab & Chassis C1998 3500

5.0L (VIN M), Compressor Wiring Diagram for GMC Cab & Chassis C1998 3500

Heater Wiring Diagram for GMC Cab & Chassis C1998 3500

5.7L

5.7L (VIN R), A/C Wiring Diagram for GMC Cab & Chassis C1998 3500

5.7L (VIN R), Compressor Wiring Diagram for GMC Cab & Chassis C1998 3500

Heater Wiring Diagram for GMC Cab & Chassis C1998 3500

6.5L

6.5L (VIN F), A/C Wiring Diagram for GMC Cab & Chassis C1998 3500

6.5L (VIN F), Compressor Wiring Diagram for GMC Cab & Chassis C1998 3500

6.5L (VIN S), A/C Wiring Diagram for GMC Cab & Chassis C1998 3500

6.5L (VIN S), Compressor Wiring Diagram for GMC Cab & Chassis C1998 3500

Heater Wiring Diagram for GMC Cab & Chassis C1998 3500

ANTI-LOCK BRAKES

5.0L

5.0L (VIN M), Anti-lock Brake Wiring Diagrams for GMC Cab & Chassis C1998 3500

5.7L

5.7L (VIN R), Anti-lock Brake Wiring Diagrams for GMC Cab & Chassis C1998 3500

6.5L

6.5L (VIN F), Anti-lock Brake Wiring Diagrams for GMC Cab & Chassis C1998 3500

6.5L (VIN S), Anti-lock Brake Wiring Diagrams for GMC Cab & Chassis C1998 3500

7.4L

7.4L (VIN J), Anti-lock Brake Wiring Diagrams for GMC Cab & Chassis C1998 3500

ANTI-THEFT

Anti-theft Wiring Diagram for GMC Cab & Chassis C1998 3500

COMPUTER DATA LINES

Computer Data Lines for GMC Cab & Chassis C1998 3500

COOLING FAN

5.0L

5.0L (VIN M), Cooling Fan Wiring Diagram for GMC Cab & Chassis C1998 3500

5.7L

5.7L (VIN R), Cooling Fan Wiring Diagram for GMC Cab & Chassis C1998 3500

7.4L

7.4L (VIN J), Cooling Fan Wiring Diagram for GMC Cab & Chassis C1998 3500

CRUISE CONTROL

5.0L

5.0L (VIN M), Cruise Control Wiring Diagram for GMC Cab & Chassis C1998 3500

5.7L

5.7L (VIN R), Cruise Control Wiring Diagram for GMC Cab & Chassis C1998 3500

6.5L

6.5L (VIN F), Cruise Control Wiring Diagram for GMC Cab & Chassis C1998 3500

6.5L (VIN S), Cruise Control Wiring Diagram for GMC Cab & Chassis C1998 3500

7.4L

7.4L (VIN J), Cruise Control Wiring Diagram for GMC Cab & Chassis C1998 3500

DEFOGGERS

Defogger Wiring Diagram for GMC Cab & Chassis C1998 3500

ELECTRONIC POWER STEERING

Electronic Power Steering Wiring Diagram for GMC Cab & Chassis C1998 3500

ENGINE PERFORMANCE

5.0L

5.0L (VIN M), Engine Performance Wiring Diagrams (1 of 4) for GMC Cab & Chassis C1998 3500

5.0L (VIN M), Engine Performance Wiring Diagrams (2 of 4) for GMC Cab & Chassis C1998 3500

5.0L (VIN M), Engine Performance Wiring Diagrams (3 of 4) for GMC Cab & Chassis C1998 3500

5.0L (VIN M), Engine Performance Wiring Diagrams (4 of 4) for GMC Cab & Chassis C1998 3500

5.7L

5.7L (VIN R), Engine Performance Wiring Diagrams (1 of 4) for GMC Cab & Chassis C1998 3500

5.7L (VIN R), Engine Performance Wiring Diagrams (2 of 4) for GMC Cab & Chassis C1998 3500

5.7L (VIN R), Engine Performance Wiring Diagrams (3 of 4) for GMC Cab & Chassis C1998 3500

5.7L (VIN R), Engine Performance Wiring Diagrams (4 of 4) for GMC Cab & Chassis C1998 3500

6.5L

6.5L (VIN F), Engine Performance Wiring Diagrams (1 of 4) for GMC Cab & Chassis C1998 3500

6.5L (VIN F), Engine Performance Wiring Diagrams (2 of 4) for GMC Cab & Chassis C1998 3500

6.5L (VIN F), Engine Performance Wiring Diagrams (3 of 4) for GMC Cab & Chassis C1998 3500

6.5L (VIN F), Engine Performance Wiring Diagrams (4 of 4) for GMC Cab & Chassis C1998 3500

6.5L (VIN S), Engine Performance Wiring Diagrams (1 of 4) for GMC Cab & Chassis C1998 3500

6.5L (VIN S), Engine Performance Wiring Diagrams (2 of 4) for GMC Cab & Chassis C1998 3500

6.5L (VIN S), Engine Performance Wiring Diagrams (3 of 4) for GMC Cab & Chassis C1998 3500

6.5L (VIN S), Engine Performance Wiring Diagrams (4 of 4) for GMC Cab & Chassis C1998 3500

7.4L

7.4L (VIN J), Engine Performance Wiring Diagrams (1 of 4) for GMC Cab & Chassis C1998 3500

7.4L (VIN J), Engine Performance Wiring Diagrams (2 of 4) for GMC Cab & Chassis C1998 3500

7.4L (VIN J), Engine Performance Wiring Diagrams (3 of 4) for GMC Cab & Chassis C1998 3500

7.4L (VIN J), Engine Performance Wiring Diagrams (4 of 4) for GMC Cab & Chassis C1998 3500

EXTERIOR LIGHTS

Backup Lamps Wiring Diagram for GMC Cab & Chassis C1998 3500

Exterior Lamps Wiring Diagram for GMC Cab & Chassis C1998 3500

GROUND DISTRIBUTION

Ground Distribution Wiring Diagram (1 of 4) for GMC Cab & Chassis C1998 3500

Ground Distribution Wiring Diagram (2 of 4) for GMC Cab & Chassis C1998 3500

Ground Distribution Wiring Diagram (3 of 4) for GMC Cab & Chassis C1998 3500

Ground Distribution Wiring Diagram (4 of 4) for GMC Cab & Chassis C1998 3500

HEADLIGHTS

Headlight Wiring Diagram, with Quad Headlamps for GMC Cab & Chassis C1998 3500

Headlight Wiring Diagram, with Sealed Beam Headlamps for GMC Cab & Chassis C1998 3500

HORN

Horn Wiring Diagram for GMC Cab & Chassis C1998 3500

INSTRUMENT CLUSTER

5.0L

5.0L (VIN M), Instrument Cluster Wiring Diagram for GMC Cab & Chassis C1998 3500

5.7L

5.7L (VIN R), Instrument Cluster Wiring Diagram for GMC Cab & Chassis C1998 3500

6.5L

6.5L (VIN F), Instrument Cluster Wiring Diagram (1 of 2) for GMC Cab & Chassis C1998 3500

6.5L (VIN F), Instrument Cluster Wiring Diagram (2 of 2) for GMC Cab & Chassis C1998 3500

6.5L (VIN S), Instrument Cluster Wiring Diagram (1 of 2) for GMC Cab & Chassis C1998 3500

6.5L (VIN S), Instrument Cluster Wiring Diagram (2 of 2) for GMC Cab & Chassis C1998 3500

7.4L

7.4L (VIN J), Instrument Cluster Wiring Diagram for GMC Cab & Chassis C1998 3500

INTERIOR LIGHTS

Courtesy Lamps Wiring Diagram, Regular Cab/Extended Cab for GMC Cab & Chassis C1998 3500

Instrument Illumination Wiring Diagram (1 of 2) for GMC Cab & Chassis C1998 3500

Instrument Illumination Wiring Diagram (2 of 2) for GMC Cab & Chassis C1998 3500

POWER DISTRIBUTION

Power Distribution Wiring Diagram (1 of 5) for GMC Cab & Chassis C1998 3500

Power Distribution Wiring Diagram (2 of 5) for GMC Cab & Chassis C1998 3500

Power Distribution Wiring Diagram (3 of 5) for GMC Cab & Chassis C1998 3500

Power Distribution Wiring Diagram (4 of 5) for GMC Cab & Chassis C1998 3500

Power Distribution Wiring Diagram (5 of 5) for GMC Cab & Chassis C1998 3500

POWER DOOR LOCKS

Door Lock Wiring Diagram, without Crew Cab for GMC Cab & Chassis C1998 3500

Keyless Entry Wiring Diagram, without Crew Cab for GMC Cab & Chassis C1998 3500

POWER MIRRORS

Photochromic Mirror Wiring Diagram for GMC Cab & Chassis C1998 3500

Power Mirrors Wiring Diagram for GMC Cab & Chassis C1998 3500

POWER SEATS

6-Way Power Seat Wiring Diagram for GMC Cab & Chassis C1998 3500

Heated Seats Wiring Diagram for GMC Cab & Chassis C1998 3500

Lumbar Wiring Diagram, Bench Seat for GMC Cab & Chassis C1998 3500

Lumbar Wiring Diagram, Bucket And Split Bench with Heated Seat for GMC Cab & Chassis C1998 3500

Lumbar Wiring Diagram, Bucket And Split Bench without Heated Seat for GMC Cab & Chassis C1998 3500

POWER WINDOWS

Power Window Wiring Diagram, 2 Door for GMC Cab & Chassis C1998 3500

Power Window Wiring Diagram, 4 Door for GMC Cab & Chassis C1998 3500

RADIO

Radio Wiring Diagrams, with Amplifier for GMC Cab & Chassis C1998 3500

Radio Wiring Diagrams, without Amplifier for GMC Cab & Chassis C1998 3500

SHIFT INTERLOCKS

Shift Interlock Wiring Diagram for GMC Cab & Chassis C1998 3500

STARTING/CHARGING

Charging Wiring Diagram for GMC Cab & Chassis C1998 3500

Starting Wiring Diagram for GMC Cab & Chassis C1998 3500

SUPPLEMENTAL RESTRAINTS

Supplemental Restraint Wiring Diagram for GMC Cab & Chassis C1998 3500

TRANSMISSION

5.0L

5.0L (VIN M), Transmission Wiring Diagram, 4L60-E for GMC Cab & Chassis C1998 3500

5.7L

5.7L (VIN R), Transmission Wiring Diagram, 4L60-E for GMC Cab & Chassis C1998 3500

5.7L (VIN R), Transmission Wiring Diagram, 4L80-E for GMC Cab & Chassis C1998 3500

6.5L

6.5L (VIN F), Transmission Wiring Diagram, 4L80-E for GMC Cab & Chassis C1998 3500

6.5L (VIN S), Transmission Wiring Diagram, 4L80-E for GMC Cab & Chassis C1998 3500

7.4L

7.4L (VIN J), Transmission Wiring Diagram, 4L80-E for GMC Cab & Chassis C1998 3500

WARNING SYSTEMS

Warning System Wiring Diagrams for GMC Cab & Chassis C1998 3500

WIPER/WASHER

Front Wiper/Washer Wiring Diagram for GMC Cab & Chassis C1998 3500