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19 Circuit Classic Customizable 1963-66 GMC / Chevy Pickup Truck Harness By Painless Performance
Made In USA
P/N 10112 $589.99
19 Circuit Classic Customizable 1963-66 GMC / Chevy Pickup Truck Harness



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H-4 Headlight Relay Harness

  • App
  • Specs

It truly is Painless Wiring with our 19 circuit 1963-1966 GMC/Chevy Pickup wiring harness.  Many of the factory connectors already installed on the harness out of the box including: the headlight connectors & switch, dimmer switch, brake switch, wiper motor & switch, horn, dash light sockets & bulbs, and warning light sockets. This harness will work with single and dual dash turn signal indicators. Each wire is custom printed with the circuit identification as well as using GM color codes for easy installation.



WarningProp 65 Warning
Hazardous Material Warning

WARNING: This product can expose you to chemicals including lead which is known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, visit

Link to P/N:
Year: 1963-1966
Make: Chevrolet, GMC
Model: Truck
Engine: Carbureted or Any Stand Alone Fuel Injection
Trans.: Any

Number of Circuits: 19 Circuits - 12 Fuses w/ Horn Relay and Maxi Fuse
Harness Length: Factory Fitment
Fuse Type: Blade & Maxi Fuse
Firewall Passthrough: Grommet
Color Code Based:  GM
Circuit Designations: Printed on Wires

Connections Included:

Wiper motor, dimmer switch, brake switch, wiper switch, headlight switch, horn, alternator, dash light sockets and warning light sockets.

Complete chassis wiring harness for:

  • 1963 GMC or Chevrolet Pickup
  • 1964 GMC or Chevrolet Pickup
  • 1965 GMC or Chevrolet Pickup
  • 1966 GMC or Chevrolet Pickup

This harness includes circuits for:

  1. A/C & Heat
  2. Accessory / Four Wheel Drive Switch
  3. Brake Lights
  4. Charging
  5. Dome Light
  6. Electric Choke
  7. Emergency flashers
  8. Fan Relay Activation Power
  9. Fused Power Source
  10. Headlights
  11. Horn (Relay)
  12. Ignition Coil
  13. Instrument Panel Lighting and Gauges*
  14. Park Lights
  15. Radio/Clock (Constant and Switched) 
  16. Starting
  17. Tail Lights and License Plate Light
  18. Turn Signals
  19. Wipers
* Including Wires For:
Fuel Gauge Cab and Tank
Generator Light
Oil Gauge
Temperature Gauge