What Color Wires Go Where On Trailer 7 Way Harness?

Question:

I bought a 6 Ft molded trailer end cord , And the wire colors are all wrong Nothing matches up . Is this because it was made in Mexico????

asked by: Lewis D

Expert Reply:

I linked an faq with wiring diagrams to show the standard colors for most 7 way trailer harnesses. That said, color is not always best to go by, so you'll want to take a circuit tester # PTW2993 and test each function before wiring the harness to your trailer. If you can tell me which vehicle you have or send in a photo, I can better help you.

expert reply by: Andrew N

Lewis K.

3/5/2024

Just asking Because when trying to change one at night in a dimly lite parking lot, it is really aggravating to have to Guese at what goes were . There should be a standard for the color coding

Andrew N.

3/5/2024

@LewisK As you can see in the help article I attached, there are diagrams that should the standard colors for wiring. But as I mentioned as a disclaimer, wires aren't ALWAYS that color. I know it's a pain sometimes, but unfortunately the circuit tester is the best bet.