Troubleshooting 2 Wire Trailer Taillights That Dont Work Installed in Place of Single Wire Lights

Published 08/16/2022

Question:

I replaced my old tail lights on boat trailer with 2 wire led lights, now the side markers don’t work at all. Please advise, thank you:

asked by: Mark

Expert Reply:

If you had single wire trailer taillights initially that meant that the assemblies grounded through the mounting hardware. If you went to a two wire light that would mean you would actually have to ground each of the assemblies using the white wire of them. You can run them back to the mounting hardware of the lights or you can run them to the main ground harness of your trailer and they should work again. You might also check to make sure that the main ground of your trailer didn't get disconnected either.

expert reply by: Jameson C