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Painless Wiring 21 Circuit Wiring Harness
Painless Wiring 21 Circuit Wiring Harness

Painless Wiring 21 Circuit Wiring Harness

Universal Fit, 21 Number of Circuits, Is Fuse Block Included, Is Compatible with GM Column

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Painless Wiring 21 Circuit Wiring Harness
Painless Wiring 21 Circuit Wiring Harness
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Part # 91064029
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  • Get FREE shipping when your order includes this item and exceeds $99! Ground shipping only in the contiguous US.


Number of Circuits:
Fuse Block Included:
Compatible with GM Column:
Ignition Key Location:
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Fuse Style:
MFG. Part #:
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Sold in Quantity:
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Includes wiring harnesses, all connectors, brackets, flashers, and zip ties.
GTIN Code:
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Harness Length:


Receive a $25 rebate when you purchase a qualifying Painless Performance chassis harness between July 1st, 2018 and August 31st, 2018. See rebate form for terms and conditions. 


This 21 circuit kit is our most widely used customizable chassis harness. You'll find that it's easily adaptable to almost any vehicle. We offer two versions, one with a preterminated GM column mounted ignition switch connector (10101 CHEV) and one without (10102 UNIV). Included with this harness are the following parts; a GM engineered fuse block & Painless mounting bracket; GM turn signal connectors; pre wired plugs for the headlights & dimmer switch; and each wire is printed with the circuit identification as well as using GM color codes for easy installation.

  • Number of Circuits: 21 Circuit - 12 Fuses w/ Horn Relay and Maxi Fuse
  • Harness Length: Universal
  • Fuse Type: Blade
  • Firewall Passthrough: Grommet
  • Color Code Based: GM
  • Circuit Designations: Printed on wire

Connectors Included (10101 CHEV): GM Steering Column Turn Switch and Ignition Switch, Dimmer Switch, Two Headlight Pigtails, 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. 

Connectors Included (10102 UNIV): GM Steering Column Turn Switch, Two Headlight Pigtails, 10SI & 12 SI Alternator, Dimmer Switch

Choose from the Universal Harness or the GM Harness (Chevy) for use with GM column-mounted ignition switch.

21 Circuit Wiring Instructions (PDF)


This harness includes circuits for:

  1. A/C & Heat
  2. Accessory / Cigarette Lighter
  3. Backup Lights
  4. Brake Lights
  5. Charging
  6. Dome Light
  7. Electric Choke
  8. Emergency Flashers
  9. Fan Relay Activation Power
  10. Fused Power Source
  11. Headlights
  12. Horn (Relay)
  13. Ignition Coil
  14. Instrument Panel Lighting and Gauges*
  15. Park Lights
  16. Radio/Clock (Constant and Switched) 
  17. Starting
  18. Tail Lights
  19. Third Brake Light
  20. Turn Signals
  21. Wipers


* Including Wires For:
Fuel Gauge
Oil Gauge
Temperature Gauge

Some parts are not legal for use in California or other states with similar laws/regulations

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