How to Determine Cold Brake Switch Wire Color
Updated 06/22/2015 | Published 06/20/2015
Question:
would you possibly know what the wire color is for the cold side wire on a 1991 GMC 2500?
asked by: Dave
1
Helpful Expert Reply:
The cold side wire is often white, but to make sure you will need to use a circuit tester like # PTW2993 to test the brake switch wires. The key might have to be turned on for this test.
You will need the wire that shows power only when the brake pedal is pressed. When you release the pedal, it should not have power. And it should also not have power with the headlights or turn signals on.
expert reply by:
Chris O
1
Product Page this Question was Asked From
Featured Help Information
Miscellaneous Media
Continue Researching
- Article: Brake Controller Installation: Starting from Scratch
- Shop: Brake Controller
- Shop: Trailer Hitch
- Q&A: Trailer Running Lights Do Not Work but Brake Lights and Turn Signals Do Work
- Q&A: How to Test Brake Controller without Trailer Connected
- Article: Trailer Wiring Diagrams
- Q&A: Recommended Bike Rack and Dual Hitch Adapter for Carrying E-Bikes While Flat Towing
- Q&A: Recommended Flat Tow Setup for a 2026 Ford Maverick
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Q&A: Trailer Turn Signals Both Blink when Just Left Turn Signal is Activated
- Article: Brake Controller Installation for 2007 (New Body Style) - 2013 GMC Sierra and Chevy Silverado
- Article: Installing an Electric Brake Controller on 2007-2013 GM Full-Size Truck or 2007-Present GM SUV
- Q&A: Troubleshooting Right Side Trailer Lights Not Working, Left Side Working Correctly
- Article: Troubleshooting 4 and 5-Way Wiring Installations
- Q&A: How to Activate 12V Trailer Power Circuit on 2017 Ford F-350 Super Duty
- Article: Wiring Trailer Lights with a 4-Way Plug (It's Easier Than You Think)