P/N 20205 $643.99
Classic-Plus Customizable 1973-1987 GM Truck Chassis Harness - 27 Circuits
Quality Tested
Lifetime Warranty
High Quality TXL Wire
*ALL NEW SQUAREBODY WIRING - To access the previous 10205 Harness manual, click here.*
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!
This harness does not support factory installed TBI fuel injection or computer controlled carburetors.
* 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 fuel 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!
Due to different front end configurations and bed lengths, this harness comes with open ended headlight and taillight wiring with extra length and can be paired with our light socket kits:
30350 - GM Pickup Socket Pigtail Kit (Single Round Headlights) (73-80)
30351 - GM Pickup Socket Pigtail Kit (Single Square Headlights) (80-87)
30352 - GM Pickup Socket Pigtail Kit (Dual Square Headlights) (80-87)
30353 - GM Suburban Socket Pigtail Kit (Dual Square Headlights) (88-91)
Prop 65 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 www.P65warnings.ca.gov.
Link to P/N: https://www.painlessperformance.com/wc/20205
Year: 1973-1987
Make: Chevrolet, GMC
Model: Truck, Blazer, Suburban
Engine: Carbureted or Stand Alone Fuel Injection
Trans.: Any
Harness Length: Factory Fitment
Fuse Type: Blade & Midi Fuse
Firewall Passthrough: Bulkhead Connector
Color Code Based: Factory GM
Circuit Designations: Printed on Wires
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.
Connections Included:
This harness includes circuits for:
- A/C & Heat
- Accessory / Camper Cover Light
- Accessory / Cigarette Lighter
- Accessory / Four Wheel Drive Switch
- Backup Lights
- Brake Lights
- Charging
- Cruise Control
- Dome and Courtesy Lights
- Electric Choke
- Electric Fuel Pump
- Emergency Flashers
- Fan Relay Activation Power
- Fused Power Source
- Headlights
- Horn (Relay)
- Ignition Coil
- Instrument Panel Lighting and Gauges*
- Park Lights
- Power Door Locks
- Power Windows
- Radio/Clock (Constant and Switched)*
- Starting
- Tail Lights
- Third Brake Light
- Turn Signals
- Wipers and Washer Pump
* Including Wires For:
Brake Warning Light
Four Wheel Drive Light
Fuel Gauge
Oil Gauge
Speakers
Tachometer
Temperature Gauge
Complete chassis wiring harness for:
- 1973 Chevrolet or GMC Pickup, Blazer, Suburban
- 1974 Chevrolet or GMC Pickup, Blazer, Suburban
- 1975 Chevrolet or GMC Pickup, Blazer, Suburban
- 1976 Chevrolet or GMC Pickup, Blazer, Suburban
- 1977 Chevrolet or GMC Pickup, Blazer, Suburban
- 1978 Chevrolet or GMC Pickup, Blazer, Suburban
- 1979 Chevrolet or GMC Pickup, Blazer, Suburban
- 1980 Chevrolet or GMC Pickup, Blazer, Suburban
- 1981 Chevrolet or GMC Pickup, Blazer, Suburban
- 1982 Chevrolet or GMC Pickup, Blazer, Suburban
- 1983 Chevrolet or GMC Pickup, Blazer, Suburban
- 1984 Chevrolet or GMC Pickup, Blazer, Suburban
- 1985 Chevrolet or GMC Pickup, Blazer, Suburban
- 1986 Chevrolet or GMC Pickup, Blazer, Suburban
- 1987 Chevrolet or GMC Pickup, Blazer, Suburban