Year Make Model | Painless Performance
Made in the USA
Closed Now
Easy To Read Printed Wiring

27 Circuit Classic-Plus Tri-Five Chevy Chassis Harness P/N 20105

27 Circuit Classic-Plus Tri-Five Chevy Chassis Harness By Painless Performance

27 Circuit Classic-Plus Tri-Five Chevy Chassis Harness By Painless Performance

American Made

Coming Soon

Part Number: 20105
Year: 1955-1957
Make: Chevrolet
Model: Bel Air, 150, 210, Nomad
Engine: Carbureted or Any Stand Alone Fuel Injection
Trans.: Any




This 27 circuit kit is designed to fit the 1955, 1956, and 1957 “Tri-Five Chevy” (150, 210, Nomad, and Bel Air) and includes additional circuits for power options and accessories. This harness features a factory location Painless mounting plate for the fuse block, front and rear lighting sockets, factory & aftermarket instrument cluster harnesses ,and dash & turn signal connectors.  This harness utilizes GM color-coded high-grade TXL wire with the circuit identification printed on it 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

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

Chassis wiring harness for:

  • 1955 Chevrolet 150, 210, Belair, Nomad, Wagon
  • 1956 Chevrolet 150, 210, Belair, Nomad, Wagon
  • 1957 Chevrolet 150, 210, Belair, Nomad, Wagon

This harness includes circuits for:

  1. AC & Heat
  2. Accessory - Ign. Switched 12V - Interior
  3. Accessory / Cigarette Lighter
  4. Amp Turn On
  5. Backup Lights
  6. Brake Lights
  7. Charging
  8. Dome Light
  9. Electric Choke
  10. Electric Fuel Pump
  11. Emergency Flashers
  12. Factory Clock
  13. Fan Relay Activation Power
  14. Fused Power Source
  15. Headlights
  16. Horn (Relay)
  17. Ignition Coil
  18. Instrument Panel Lighting & Gauges*
  19. Park Lights
  20. Power Door Locks
  21. Power Windows
  22. Radio (Constant & Switched)*
  23. Starting
  24. Tail Lights
  25. Third Brake Light
  26. Turn Signals
  27. Wipers