How to Repair or Install Trailer Wiring

You're almost done! The only thing to do now is test your new wiring at the critical point -- the trailer connector. Get your buddy to pitch in again, and go through the lights one by one, checking to be sure there is a signal at the trailer connector. If you get a light every time, you're done! Now you can put your tail lights back.

If one of your circuits doesn't seem to be working, go back and check the connection to be sure. If the connection seems good, check the fuse. Sometimes you can blow a fuse without even knowing it.