As I said earlier, it's his port side signal/brake light. that is the yellow wire. It shouldn't be connected to any side lights, just a straight wire from front connection to light. Pull a new wire is less time than trying to redo splices that will cause problems again.

If you aren't proficient at troubleshooting electrical problems hire someone to run a new wiring harness. You will be money and time ahead. They are cheap and it's about a hour job. Once you begin having to track down bad connections and splices on trailer wiring, it goes downhill from there and unless you know what you are doing, you will end up with worse than what you have now.

I�m actually considering taking it to Uhaul and have them run new wires and install of my new LED lights. I found a bunch of Optronics LED�s on amazon cheap. I�ve been hit once from behind pulling my last boat, so I figure a bunch of LED lights will help stop that.

Ok well I try to live life by K.I.S.S..... keep it simple stupid... tonight I�m installing my new LED�s to my trailer and I see to wires unplugged / broken, well 2 + 2 = 4, splice both wires back together and it�s alive.

All is good again, thanks for all the help guys

Glad you got it going Mike. For future reference or anyone else having problems like you had is checking (if you have the sealed oval lights) is check the connection on the back of the light fixture itself. The connectors are thin brass that has a slit in it (for spring tension effect), sometimes these can get spread out and not make contact with the plug itself. You have to get a pair of needle nose in there and squeeze it together be careful though, like I said they are thin brass.