Troubleshooting a Tail Light Not Working Properly When Hooked Up to Flat Tow Wiring

Question:

Hey I have my JL wired up per instructions and videos. All lights work with the exception of the drivers side brake/signal light. The left works and the running lights work. Is there a trouble shoot suggestion for this issue? I have checked for shorts and found none. The light works like regular when not connected. Thanks!

asked by: Kenneth H

Expert Reply:

Since everything is working except for the one function (drivers side tail light) some possible issues could be the harness wires are not connected to vehicle correctly/securely, a set of connectors is not seated together properly or is not making a good connection or a required fuse or relay is blown or missing. Could also be an insufficient ground or short to ground on trailer or vehicle side. A Hook Probe Circuit Tester # PTW2993 will be helpful in testing at each connection point.

I have included a help article that provides more in depth information on possible issues and ways to test them.

expert reply by: Scott S