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: Where is the Dummy Plug to Install a Brake Controller Adapter on 2019 Chevrolet Silverado 1500
- Q&A: Parts Needed For Flat Towing a 2024 Ford Maverick Behind a 2010 Winnebago Journey With Air Brakes
- Q&A: How To Wire In The V-Shaped Identification Light Bar When Replacing Light With Only 1 Wire
- Q&A: Caliper Bolts for AL-KO/Hayes Disc Brake Caliper BP18-050
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Q&A: Replacement Oil Seal for AL-KO 568303
- Q&A: Does The Progressive Dynamics PD4655V Have A Lithium Jumper
- Article: Wiring Trailer Lights with a 6-Way Plug (It's Easier Than You Think)
- Article: Trailer Maintenance Schedule
- Q&A: Which Instructions Are Used Installing a Roadmaster Brake-Lite Relay in a Ford F-150 w/ Neutral Tow
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Article: Parts Needed to Add Electric Drum Brakes to a Trailer
- Article: Wiring Trailer Lights with a 4-Way Plug (It's Easier Than You Think)