Painless Classic-Plus Customizable 73-87 GM Pickup Truck Chassis Harness - 27 Circuits
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This 27 circuit 1973-1987 GMC/Chevy Painless wiring harness was designed to fit the trucks, Blazers, and Suburbans*, whether C10, C20, or C30. It features a factory style bulkhead connector, allowing for easy mounting of the fuse block in the factory location, and has many of the factory connectors already installed on the harness out of the box. Including connectors for: the headlight 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. Wire your Squarebody once and wire it right with Painless!
* Doesn't support rear power glass, rear defrost, or rear A/C/Heat - many of these items are separate from the OE chassis harness
Factory Style bulkhead connector mounts directly in the original location - no modification to firewall is needed!
Most of the connectors come pre-terminated, making for a painless install!
High amperage charge wire is included allowing you to easily run modern alternators. The included Midi fuse protects the system, getting rid of the troublesome fusible links that can leave you stranded with no easy fix!
Dual fuel tank ready! If your Squarebody is a dual tank truck, simply use our included dual tank wiring harness to keep both fual tanks functioning like the factory intended.
For the few non-preterminated connections, mastic heatshrink is included. This will allow you to make professional and waterproof connections with a clean appearance!
Each harness comes open ended headlight and taillight wiring with extra length and can be paired with our light socket kits:
Harness Length: Factory Fitment
Fuse Type: Blade & Midi Fuse
Firewall Pass through: Bulkhead Connector
Color Code Based: Factory GM
Circuit Designations: Printed on Wires
Part Number: 20205
Year: 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987
Make: Chevrolet or GMC
Model: C10, C20, C30, Blazer, Suburban
Engine: Carbureted or Any Stand Alone Fuel Injection
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
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
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)*
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