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Easy To Read Printed Wiring

Classic-Plus Customizable 73-87 GM Pickup Truck Chassis Harness - 27 Circuits P/N 20205

Classic-Plus Customizable 73-87 GM Pickup Truck Chassis Harness - 27 Circuits By Painless Performance


Classic-Plus Customizable 73-87 GM Pickup Truck Chassis Harness - 27 Circuits By Painless Performance


$643.99

 

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  • Application
  • Specs

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, Suburban
Engine: Carbureted or Stand Alone Fuel Injection
Trans.: Any

 

 

*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!

 

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:


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)

 

 

WarningProp 65 Warning
Hazardous Material Warning

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.

Number of Circuits: 27 Circuits - 18 Fuses w/ Horn Relay & Maxi Fuse
Harness Length: Factory Fitment
Fuse Type: Blade & Midi Fuse
Firewall Passthrough: Bulkhead Connector
Color Code Based:  Factory GM
Circuit Designations: Printed on Wires


Connections 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
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

 

Suggested Parts

 

30350

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GM Pickup Socket Pigtail Kit (Single Round Headlights) (73-80)

 

30351

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GM Pickup Socket Pigtail Kit (Single Square Headlights) (80-87

 

30352

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GM Pickup Socket Pigtail Kit (Dual Square Headlights) (80-87)

 

30353

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GM Suburban Socket Pigtail Kit (Dual Square Headlights) (88-91

 

70920

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