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I have both the 7 prong and 4 flat wires on my truck. They worked fine for the longest time now for some reason I dont have running lights for my trailer I have brake light and turn signal lights just not running lights. I did use a volt meter to check it at the socket and nothing. The only thing I can thing of to do is start following the wire back and see if there is a spot where there is a break in the line. However before I do that is there a fuse anywhere that I should know about for the running lights. Thanks
Also the electric trailer brakes work fine and like I said all other lights work.
Thanks for the quick reply that was the answer I was looking for. When I go home to day I will check it. It that is the problem it should be an easy fix unless it keeps blowing the fuse