Found out today after I wired my boat trailer that my running lights do not work on my trailer, nor on the actual 7 way. Do you connect straight up to the taillight or is there a wiring harness? I have not followed the wire but would like to know ahead of time.

 

Go ahead and cancel viewers! It was just a fuse.... Never have I had a vehicle prewired for a trailer so a fuse was the last thing on my mind.