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Painless Performance

Painless Performance - 27 Circuit 1973-87 GM Pickup Truck Chassis Harness


 Product Description

Guaranteed Painless American Made

Year: 1973 - 1987 
Make: Chevrolet or GMC 
Model: C & K Truck/SUV 
Engine: Non Fuel Injected 
Trans.: Non Electronic 

This harness is formerly known as our 18 circuit kit. Click here to read about the recent changes.

This 27 circuit 1973-1987 GMC/Chevy harness was designed to fit the trucks, Blazers, and Suburbans. It features a factory style bulkhead connector and has many of the factory connectors already installed on the harness out of the box. Including: the headlight connectors & switch, dimmer switch, wiper motor, ignition switch, blower motor & switch, blower resistor, and instrument cluster. Each wire is custom printed with the circuit identification as well as using GM color codes for easy installation.

Number of Circuits: 27 Circuits - 18 Fuses w/ Horn Relay & Maxi Fuse
Harness Length: Factory Fitment
Fuse Type: Blade & Maxi Fuse
Firewall Passthrough: Bulkhead Connector
Color Code Based: Factory GM
Circuit Designations: Printed on Wires
Connectors Included: Ignition switch, headlight switch, dimmer swtich, wiper motor, blower switch, blower motor, blower resistor, instrument cluster and headlights, 10SI & 12 SI Alternator, HEI Power and Tach and 20 Extra 56 Series Terminals for use with any Factory GM 56 Series Connector such as Headlight Switch, Wiper Switch or A/C Switch/Blower Motor.


This harness includes circuits for: 

  1. A/C & Heat
  2. Accessory / Camper Cover Light
  3. Accessory / Cigarette Lighter
  4. Accessory / Four Wheel Drive Switch
  5. Backup Lights
  6. Brake Lights
  7. Charging
  8. Cruise Control
  9. Dome and Courtesy Lights
  10. Electric Choke
  11. Electric Fuel Pump
  12. Emergency Flashers
  13. Fan Relay Activation Power
  14. Fused Power Source
  15. Headlights
  16. Horn (Relay)
  17. Ignition Coil
  18. Instrument Panel Lighting and Gauges*
  19. Park Lights
  20. Power Door Locks
  21. Power Windows
  22. Radio/Clock (Constant and Switched)*
  23. Starting
  24. Tail Lights
  25. Third Brake Light
  26. Turn Signals
  27. Wipers and Washer Pump

* Including Wires For:
Brake Warning Light
Four Wheel Drive Light
Fuel Gauge
Oil Gauge
Temperature Gauge


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