What are the Red, Black, Green, and White Wires on a Trailer for

Question:

Helll! I have a 4 wire connection. The colors on my trailer are red,black, green and white. I am wiring a new 4 Way plug on and the wires are white, brown, yellow and green. I was wondering what colors to match up? Thanks for the help!

asked by: Chris

Expert Reply:

In regards to the 4-way wiring harness you are trying to install; the white wire is for the ground, the brown wire is for the running lights, the yellow wire is for the left turn/brake light, and the green wire is for the right turn/brake light. Unfortunately, the only way to know for sure what is on the trailer would be to test them with a circuit tester.

I have attached our wiring help article for you as well which may help but you will need to test regardless.

expert reply by: Conner L