Finding Ground Circuit of 7-Way Wiring With Unknown Wire Colors
Updated 05/14/2018 | Published 05/11/2018
Question:
I have a six wire cable on my trailer. Brown, black, green, red, yellow, blue. I need to rewire to a 7 pin harness to hook up to my pickup. I was not present when the old harness was removed and I now cant identify functions of the wires I believe because Im not realizing which one is my ground. Please help me out
asked by: Tayler
Expert Reply:
None of those wire colors are standard ground wire colors. Typically it's a white wire. The rest of your wires look standard for the most part but since you don't have a white wire you may have to do some testing. You can try using a jumper wire from a 12 volt power source like a battery to apply voltage on each of the circuits to see what taillight functions apply.
The ground will spark when you touch the wires together.
Product Page this Question was Asked From
Continue Researching
- Q&A: Trailer Running Lights Do Not Work but Brake Lights and Turn Signals Do Work
- Article: Trailer Wiring Diagrams
- Q&A: How to Test Brake Controller without Trailer Connected
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Q&A: Trailers Right Tail Light Stays on Even While Unplugged
- Q&A: Recommended Warm White 4-1/4" Diameter Puck Light
- Article: Brake Controller Installation: Starting from Scratch
- Q&A: Troubleshooting Right Side Trailer Lights Not Working, Left Side Working Correctly
- Article: Troubleshooting 4 and 5-Way Wiring Installations
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Q&A: Troubleshooting Blown Vehicle Fuses Every Time Trailer is Connected
- Q&A: Suspension Enhancement Recommendation for 2003 Toyota Tundra with B and W Turnoverball
- Article: Wiring Trailer Lights with a 4-Way Plug (It's Easier Than You Think)
- Article: Trailer Lights Not Working After Winter? Test Truck or Trailer