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Tuesday 03/20/2018
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19 Circuit Classic Customizable 1963-66 GMC/Chevy Pickup Harness By Painless Performance

P/N 10112

19 Circuit Classic Customizable 1963-66 GMC/Chevy Pickup Harness

In Dash Ignition

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Year: 1963 - 1966
Make: Chevrolet or GMC
Model: C & K Truck
Engine: Carbureted or Any Stand Alone Fuel Injection
Trans.: Any
American Made


This 19 circuit 1963-1966 GMC/Chevy Pickup harness has many of the factory connectors already installed on the harness out of the box. Including: the headlight connectors & switch, dimmer switch, brake switch, wiper motor & switch, horn, dash light sockets & bulbs, and warning light sockets. This harness will work with single and dual dash turn signal indicators. Each wire is custom printed with the circuit identification as well as using GM color codes for easy installation.

GM Column Installation KitPowerBraid and Dressup Accessories Link


Number of Circuits: 19 Circuits - 12 Fuses w/ Horn Relay and Maxi Fuse
Harness Length: Factory Fitment
Fuse Type: Blade & Maxi Fuse
Firewall Passthrough: Grommet
Color Code Based: GM
Circuit Designations: Printed on Wires
Connectors Included: Wiper motor, dimmer switch, brake switch, wiper switch, headlight switch, horn, alternator, dash light sockets and warning light sockets.

This harness includes circuits for:


  1. A/C & Heat
  2. Accessory / Four Wheel Drive Switch
  3. Brake Lights
  4. Charging
  5. Dome Light
  6. Electric Choke
  7. Emergency flashers
  8. Fan Relay Activation Power
  9. Fused Power Source
  10. Headlights
  11. Horn (Relay)
  12. Ignition Coil
  13. Instrument Panel Lighting and Gauges*
  14. Park Lights
  15. Radio/Clock (Constant and Switched) 
  16. Starting
  17. Tail Lights and License Plate Light
  18. Turn Signals
  19. Wipers
* Including Wires For:
Fuel Gauge Cab and Tank
Generator Light
Oil Gauge
Temperature Gauge

 19 Circuit Classic Customizable 1963-66 GMC/Chevy Pickup Harness By Painless Performance



ECM Flash Program



This is a basic start and run tune that we only recommend for a near stock application. We will only change the following parameters: delete VATS/PASS-KEY security, cooling fan on/off temperatures, rear end gear ratio, tire size, speed limiter, rpm limiter, idle rpm, and we will adjust the check engine light parameters. If your setup requires any other parameters tuned you will need to locate a local tuner. All ECMs are left unlocked to allow easy access for your tuner.

Step 1: Purchase one of the qualifying part numbers. See below for that list.

Step 2: If your part number is highlighted RED proceed to step 3B. If your part number is highlighted BLACK, proceed to step 3A.

Step 3A: If you have arrived at this step, your harness does not come with an ECM and you must provide one to be flashed. Please reference the manual with your harness to confirm the ECM part number required.

Step 4A: Once you have received your harness, please cut the Barcode label from the box as shown in the picture below.

Step 5A: Package and mail your ECM along with the Barcode label, a copy of your purchase receipt, and your ECM form that you are about to complete. (The address will be provided after you complete the form). We will pay for return ground shipping*. If you request a faster service, you will need to provide a return label.

Step 3B: If you have arrived at this step, your purchase comes with an ECM. You must fill out our ECM form BEFORE your purchase will ship. Proceed to Step 6.

Step 6: Click the “Start Here” button below to fill out our ECM questionnaire.

Step 7: Once we have the ECM, we will use the data from the form to flash the ECM. Then, once it has been flashed we will package the ECM and ship it back to you. If we encounter a question, we will contact you. This process can take 1-3 days.

Step 8: Once you receive your ECM, it is ready to go.


*Note: Our free return shipping is ONLY good for the lower 48 states, via ground UPS. If you are outside of those states, you must provide a return shipping label with your order. If your purchase comes with an ECM, the shipping will be covered via the retailer you purchased from.



Click the Start Here button below to get your FREE ECM Flash!

Click Here To Start The ECM Reflash Process


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