1990 GMC C3500 Pickup Wiring Diagrams (ONLINE REPAIR MANUALS)

Auto Parts Search


Learn how to repair a car or truck, install or remove parts, wire an engine, reset warning lights, replace fuel filter, fix auto body and more. Get Automotix DIY!
Help me findSearch
Get Full Access Automotix DIY provides automotive consumers and do it yourselfers; the most comprehensive repair information about 1990 GMC C3500 Pickup car and truck repair procedures including GMC engine diagrams, wiring diagrams, repair work estimating measures, technical service bulletins, auto body work guidance, starter & alternator replacement procedures, serpentine belt replacement procedures, radiator & hose replacement procedures, tune-up & drivability specifications, quick lube illustrations, preventive maintenance guide, engine light reset instructions, parts removal and install procedures, fuel filter replacement directions, component location diagrams, air filter locations & replacement instructions, a/c system specifications, and general auto service procedures. You don't have to be a car mechanic or technician to know how to fix your 1990 GMC C3500 Pickup automobile. Try the Automotix DIY solution today!
DIY REPAIR SAMPLES > CONTINUE EXPLORING >

We have info for following modifications of 1990 GMC C3500 Pickup

  • 1990 GMC C3500 Pickup Sierra 6.2 V8 DIESEL, CID:379, Fuel Injection, Aspiration:379, Engine VIN:, Desg:J
  • 1990 GMC C3500 Pickup Sierra 5.7 V8 GAS, CID:350, Fuel Injection, Aspiration:350, Engine VIN:, Desg:K
  • 1990 GMC C3500 Pickup Sierra 7.4 V8 GAS, CID:454, Fuel Injection, Aspiration:454, Engine VIN:, Desg:N
  • 1990 GMC C3500 Pickup Sierra XC 6.2 V8 DIESEL, CID:379, Fuel Injection, Aspiration:379, Engine VIN:, Desg:J
  • 1990 GMC C3500 Pickup Sierra XC 5.7 V8 GAS, CID:350, Fuel Injection, Aspiration:350, Engine VIN:, Desg:K
  • 1990 GMC C3500 Pickup Sierra XC 7.4 V8 GAS, CID:454, Fuel Injection, Aspiration:454, Engine VIN:, Desg:N

WIRING DIAGRAMS FOR 1990 GMC C3500 Pickup AUTOMOBILES

OEM drawn wiring diagrams for most 1990 GMC C3500 Pickup cars and light trucks sold in the U.S.

1990 GMC C3500 Pickup Sierra XC 7.4 V8 GAS Wiring Diagram1990 GMC C3500 Pickup Sierra XC 7.4 V8 GAS Wiring Diagram

Components on diagram:
  • A/C Compressor Clutch
  • A/C Pressure Cycling Switch
  • Headlamps Switch
  • A/C Air Inlet Valve Motor Pressure Switch
  • Panel & Interior Lamps Control Switch
    • 1990 GMC C3500 Pickup Sierra 6.2 V8 DIESEL Wiring Diagram1990 GMC C3500 Pickup Sierra 6.2 V8 DIESEL Wiring Diagram

    Components on diagram:
  • Fuel Pump
  • Fuel Pump Relay
  • Fuel Pump Oil Pressure Switch
  • Fuel Tank Sensor
  • Assembly Line Diagnostic Link Connector
    • 1990 GMC C3500 Pickup Sierra 6.2 V8 DIESEL Wiring Diagram1990 GMC C3500 Pickup Sierra 6.2 V8 DIESEL Wiring Diagram

    Components on diagram:
  • Glow Plug Controller
  • Cold Advance Control
  • Cold Advance Relay
  • Right Bank Glow Plug
  • Left Bank Glow Plug
    • 1990 GMC C3500 Pickup Sierra 7.4 V8 GAS Wiring Diagram1990 GMC C3500 Pickup Sierra 7.4 V8 GAS Wiring Diagram

    Components on diagram:
  • Convenience Center
  • Auxiliary Battery Relay
  • Auxiliary Battery
    • 1990 GMC C3500 Pickup Sierra 5.7 V8 GAS Wiring Diagram1990 GMC C3500 Pickup Sierra 5.7 V8 GAS Wiring Diagram

    Components on diagram:
  • Starter Solenoid
  • Battery
  • Radio
  • Ignition Switch
  • Convenience Center
    • 1990 GMC C3500 Pickup Sierra 5.7 V8 GAS Wiring Diagram1990 GMC C3500 Pickup Sierra 5.7 V8 GAS Wiring Diagram

    Components on diagram:
  • Headlamp Switch
  • Blower Switch
  • Blower Motor
  • Resistor
  • Heater Lamp
    • 1990 GMC C3500 Pickup Sierra XC 5.7 V8 GAS Wiring Diagram1990 GMC C3500 Pickup Sierra XC 5.7 V8 GAS Wiring Diagram

    Components on diagram:
  • Auxiliary Cooling Fan Temperature Switch
  • Auxiliary Cooling Fan
  • Auxiliary Cooling Fan Relay
    • 1990 GMC C3500 Pickup Sierra XC 5.7 V8 GAS Wiring Diagram1990 GMC C3500 Pickup Sierra XC 5.7 V8 GAS Wiring Diagram

    Components on diagram:
  • Clutch Switch
  • Convenience Center
  • Brake Switch
  • Cruise Control Switch
  • Redundant Cruise Release Switch
    • 1990 GMC C3500 Pickup Sierra 7.4 V8 GAS Wiring Diagram1990 GMC C3500 Pickup Sierra 7.4 V8 GAS Wiring Diagram

    Components on diagram:
  • Right Side Marker Lamp
  • Convenience Center
  • Hazard Flasher
  • Left Side Marker Lamp
  • Directional Signal Switch
    • 1990 GMC C3500 Pickup Sierra 7.4 V8 GAS Wiring Diagram1990 GMC C3500 Pickup Sierra 7.4 V8 GAS Wiring Diagram

    Components on diagram:
  • Headlamp Switch
  • Park Brake Switch
  • Right Side Marker Lamp
  • Left Side Marker Lamp
  • Headlamp Dimmer Switch

    • CLICK HERE TO GET FULL ACCESS TO 1990 GMC C3500 Pickup WIRING DIAGRAMS!

    Shop online for auto body parts, engines, wheels, lights...

    More parts
    Help me findSearch
    Auto Repair Quick Search
    Help me find
    Search
    Search DIY repair manuals by VIN...
    Vehicle Identification Number is a unique serial number used by the automotive industry to identify individual motor vehicles

    Find out what info we have for your vehicle

    Need To Fix Your Car or Truck?
    Try Our Repair Service Finder
    Post Your Auto Repair Needs
    Save Money With Free Car Insurance Quote
    FREE car insurance quote
    Enter Zip Code:
    Auto Repair Quick Search
    Help me find
    Search