Red, Black, and White Wire Functions on Old Trailer Light
Question:
Hello I have a stop and tail light that needs replaced. I have purchased a light and my camper trailer has a red, a black, and a white wire. The light I purchased had a green, a rust colored wire and a spot for the white ground screw. Can you please help me understand my wires please.
asked by: Shirley G
Expert Reply:
It is likely that the red wire on your old lights is the turn signal/brake light wire, and the black wire is the running light wire. That would make the white wire the ground. You can verify this by testing the wires using a circuit tester such as # PTW2993. Connect the trailer to the tow vehicle and have someone operate the light functions while you test the wires.
On your new light it sounds like the green wire is turn signal/brake light, brown is running light, and it grounds through the mounting hardware. You could crimp a ring terminal to the end of the white wire so that the mounting hardware can go through it to ground the light.
Kurt H.
7/12/2020
I have an old snowmobile trailer I am wiring and putting a new 4 pin harness on. The snowmobile trailer wires consist of a yellow, red, green, and black/brown wire. The 4 pin harness has white, green, brown, and yellow. What goes where? I assumed all colors went together and then red went with white but not the case. Please help.
Chris R.
7/16/2020
Donald T.
5/31/2020
Can you please tell me the light has 3-wires? The red is + positive? right? The black is - negative? right? What is the Yellow? Thanks
Chris R.
6/3/2020
Donald T.
6/3/2020
Donald T.
6/3/2020
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11/16/2021
Can someone give me suggestions on how to hook up running lights on a trailer that is wired only with red and white wires?