Do you hook your trailer up with the vehicle running or off. The reason I'm asking is that a couple of years ago when I bought my utility trailer, they hooked it up at the dealer and the lights didn't work. I was about to ask for my money back when the guy climbed in my truck and killed the engine and restarted it. The lights came right on. This was on a Ford though. Not sure what you drive. May have a severed wire or connection also.
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