Troubleshooting Trailer Light Installation Where Wires Don't Match
Question:
My new lights on trailer has black an red , I need to know witch colors go to red and what to black ? My harness has red , green , yellow , white black
asked by: Shayne
Expert Reply:
The color of the wiring isn't always correct in telling you the function of the wiring; unless you wired the harness yourself and know the functions, you'll need to test the harness and figure out what wires provide power on the circuit you're seeking to install the lights on using a circuit tester like the # PTW2993. Typically green and yellow will correspond to the turn signals, white is the ground and brown is the running light circuit; red and black typically aren't found in 4 or 5 wire trailering wiring harnesses and only on 7 way RV/trailer plugs.
When it comes to your lights, and having no idea what lights you are using, I would assume that the black is the power, the red is for a blinking circuit and the lights are self grounding. If you can clarify a bit on the type of lights you've got and the trailer wiring you're using I can provide a bit more targeted information on this. I've also linked some helpful articles we did on trailer wiring that have some diagrams you may find helpful.
Products Referenced in This Question
Product Page this Question was Asked From
Continue Researching
- Article: Trailer Wiring Diagrams
- Q&A: Parts Needed For Flat Towing a 2024 Ford Maverick Behind a 2010 Winnebago Journey With Air Brakes
- Q&A: Caliper Bolts for AL-KO/Hayes Disc Brake Caliper BP18-050
- Q&A: Replacement Oil Seal for AL-KO 568303
- Q&A: Does The Progressive Dynamics PD4655V Have A Lithium Jumper
- Q&A: Which Instructions Are Used Installing a Roadmaster Brake-Lite Relay in a Ford F-150 w/ Neutral Tow
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Q&A: Recommended Diode for Charging Line From Motorhome to Towed Vehicle (Toad)
- Article: Parts Needed to Add Electric Drum Brakes to a Trailer
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Article: Trailer Maintenance Schedule
- Q&A: What Gauge Wire does 4-Way Trailer Wiring Use
- Article: Trailer Tire Sizing
- Article: Flat Towing Package for 2014-2015 Chevrolet Equinox