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GMC Cab & Chassis C3500 (1985–2000) wiring diagrams

List of systems:

A/c circuit Heater circuit

5.7l (vin r), a/c circuit 5.7l (vin r), compressor circuit 5.7l vin r, heater circuit 5.7l vin r, manual a/c circuit Heater circuit

6.5l (vin f), a/c circuit 6.5l (vin f), compressor circuit 6.5l vin f, manual a/c circuit Heater circuit

7.4l (vin j), a/c circuit 7.4l (vin j), compressor circuit 7.4l vin j, heater circuit 7.4l vin j, manual a/c circuit Heater circuit

All-wheel abs circuit, with drl All-wheel abs circuit, without drl Anti-lock brake circuits Rear abs circuit, with drl Rear abs circuit, without drl

5.7l (vin r), anti-lock brake circuits

6.5l (vin f), anti-lock brake circuits

7.4l (vin j), anti-lock brake circuits

Anti-theft circuit Forced entry circuit Pass-key circuit Passlock circuit

Computer data lines Data link connector circuit

4.3l (vin z), data link connector circuit

5.0l (vin h), data link connector circuit, a/t 5.0l (vin h), data link connector circuit, m/t

5.7l (vin k), data link connector circuit, a/t 5.7l (vin k), data link connector circuit, m/t 5.7l (vin k) hd, data link connector circuit, a/t 5.7l (vin k) hd, data link connector circuit, m/t

6.5l (vin f), data link connector circuit 6.5l (vin p), data link connector circuit 6.5l (vin s), data link connector circuit

7.4l (vin n), data link connector circuit

Cooling fan circuit

5.7l (vin r), cooling fan circuit

7.4l (vin j), cooling fan circuit

4.3l (vin z), cruise control circuit

5.0l (vin h), cruise control circuit

5.7l (vin k), cruise control circuit 5.7l (vin r), cruise control circuit

6.5l (vin f), cruise control circuit 6.5l (vin p), cruise control circuit 6.5l (vin s), cruise control circuit

7.4l (vin j), cruise control circuit 7.4l (vin n), cruise control circuit

Defogger circuit

Electronic power steering circuit

Wiring diagram engine performance 4.3l (vin z)s, a/t Wiring diagram engine performance 4.3l (vin z)s, m/t

Wiring diagram engine performance 5.0l (vin h)s, a/t Wiring diagram engine performance 5.0l (vin h)s, m/t

Wiring diagram engine performance 5.7l vin ks Wiring diagram engine performance 5.7l (vin k)s, a/t Wiring diagram engine performance 5.7l (vin k)s, m/t Wiring diagram engine performance 5.7l (vin r)s

Wiring diagram engine performance 6.5l (vin f)s Wiring diagram engine performance 6.5l (vin f)s, 4l60e a/t Wiring diagram engine performance 6.5l (vin f)s, 4l80-e a/t Wiring diagram engine performance 6.5l (vin f)s, 4l80e a/t Wiring diagram engine performance 6.5l (vin f)s, m/t Wiring diagram engine performance 6.5l (vin p)s, 4l60-e a/t Wiring diagram engine performance 6.5l (vin p)s, 4l60e a/t Wiring diagram engine performance 6.5l (vin p)s, 4l80e a/t Wiring diagram engine performance 6.5l (vin p)s, m/t Wiring diagram engine performance 6.5l (vin s)s, 4l60e a/t Wiring diagram engine performance 6.5l (vin s)s, 4l80-e a/t Wiring diagram engine performance 6.5l (vin s)s, 4l80e a/t Wiring diagram engine performance 6.5l (vin s)s, m/t

Wiring diagram engine performance 7.4l (vin j)s Wiring diagram engine performance 7.4l (vin n)s, a/t Wiring diagram engine performance 7.4l (vin n)s, m/t

Back-up lamps circuit Backup lamps circuit Exterior lamps circuit Exterior light circuit Rear clearance lamps circuit Rear clearance lamps circuit, with dual rear wheels

Ground distribution circuit

Fog lamp circuit, composite with drl Fog lamp circuit, sealed beam with drl Headlamps circuit, drl with composite lamps Headlamps circuit, drl with sealed beam lamps Headlamps circuit, with sealed beam lamps Headlamps/fog lamps circuit, with composite lamps Headlight circuit, composite with drl Headlight circuit, composite without drl Headlight circuit, sealed beam with drl Headlight circuit, sealed beam without drl Headlight circuit, with quad headlamps Headlight circuit, with sealed beam headlamps Headlight circuit, with sealed beam lamps

Horn circuit

Instrument cluster circuit, diesel Instrument cluster circuit, gasoline

5.7l (vin r), instrument cluster circuit

6.5l (vin f), instrument cluster circuit

7.4l (vin j), instrument cluster circuit

Courtesy lamp circuit Courtesy lamp circuit, crew cab with auxiliary lighting Courtesy lamp circuit, crew cab with overhead roof console Courtesy lamps circuit Courtesy lamps circuit, crew cab with auxiliary lighting Courtesy lamps circuit, crew cab without auxiliary lighting Courtesy lamps circuit, old style Courtesy lamps circuit, regular cab/extended cab Courtesy lamps circuit, without auxiliary lighting Instrument illumination circuit Instrument illumination circuit, old style Overhead console lamps circuit Overhead console lamps circuit, old style base

Power distribution circuit Power distribution circuit, diesel Power distribution circuit, gasoline

Door lock circuit, 2 door Door lock circuit, 4 door Door lock circuit, crew cab Door lock circuit, with crew cab Door lock circuit, with crew cab or utility Door lock circuit, without crew cab Keyless entry circuit Keyless entry circuit, 2 door Keyless entry circuit, 4 door Keyless entry circuit, crew cab Keyless entry circuit, with crew cab or utility Keyless entry circuit, without crew cab

Electrochromic mirror circuit Photochromic mirror circuit Power mirror circuit Power mirrors circuit

6-way power seat circuit Front seat heater circuit Heated seats circuit Lumbar circuit Lumbar circuit, bench seat Lumbar circuit, bucket and split bench seat Lumbar circuit, bucket and split bench with heated seat Lumbar circuit, bucket and split bench without heated seat Lumbar circuit, with bucket seat Lumbar circuit, without bucket seat Power seat circuits

Power window circuit Power window circuit, 2 door Power window circuit, 4 door Power window circuit, crew cab

2-speaker system circuit Am/fm stereo Am/fm stereo, with cassette & amplifier Radio circuits, with amplifier Radio circuits, without amplifier

Shift interlock circuit

Charging circuit Starting circuit

4.3l (vin z), charging circuit 4.3l (vin z), starting circuit

5.0l (vin h), charging circuit 5.0l (vin h), starting circuit

5.7l (vin k), charging circuit 5.7l (vin k), starting circuit 5.7l vin r, charging circuit 5.7l vin r, starting circuit

6.5l (vin f), charging circuit 6.5l (vin f), starting circuit 6.5l (vin p), charging circuit 6.5l (vin p), starting circuit 6.5l (vin s), charging circuit 6.5l (vin s), starting circuit

7.4l vin j, charging circuit 7.4l vin j, starting circuit 7.4l (vin n), charging circuit 7.4l (vin n), starting circuit

Supplemental restraint circuit

4.3l (vin z), transmission circuit, 4l60-e 4.3l (vin z), transmission circuit, 4l80-e Transfer case circuit, except k300 Transfer case circuit, k300 only

5.0l (vin h), transmission circuit, 4l60-e Transfer case circuit, except k300 Transfer case circuit, k300 only

5.7l vin k, a/t circuit, 4l60-e 5.7l (vin k), transmission circuit, 4l60-e 5.7l (vin k), transmission circuit, 4l80-e 5.7l vin r, a/t circuit, 4l60-e 5.7l vin r, a/t circuit, 4l80-e 5.7l (vin r), transmission circuit, 4l60-e 5.7l (vin r), transmission circuit, 4l80-e Transfer case circuit Transfer case circuit, except k300 Transfer case circuit, k300 only

6.5l vin f, a/t circuit, 4l80-e 6.5l (vin f), transmission circuit 6.5l (vin f), transmission circuit, 4l80-e 6.5l (vin p), transmission circuit 6.5l (vin p), transmission circuit, 4l60-e 6.5l (vin p), transmission circuit, 4l80-e 6.5l (vin s), transmission circuit 6.5l (vin s), transmission circuit, 4l80-e Transfer case circuit Transfer case circuit, except k300 Transfer case circuit, k300 only

7.4l vin j, a/t circuit, 4l80-e 7.4l (vin j), transmission circuit, 4l80-e 7.4l (vin n), transmission circuit, 4l80-e Transfer case circuit Transfer case circuit, except k300 Transfer case circuit, k300 only

Warning system circuits Warning system circuits, base Warning system circuits, luxury & performance

Front washer/wiper circuit Front wiper/washer circuit Wiper/washer circuit

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