Trailer lights don't work when car headlights are on?

I just installed a hitch on to my 07 Hyundai Tucson. The lights on the trailer work when the headlights on the car are off but once I turn them on the lights on the trailer don't work. Does anyone know why this may happen?

Not really enough info. but the lights on the trailer shouldn't be on unless lights in vehicle are on. It must be wired wrong.

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Jeep trailer hitch wires?

I have a 2004 Rubicon and have a lighted sign that fits into the trailer hitch. I've never set up anything to tow and can't find the wires to attach it to. Anybody know where to find the trailer wires or have any suggestions?

don't do anything till you go to the U-Haul rental store, they can fix you up , i dicked around 1 day with a trailer hitch, i was told to go to u-haul, and he was right on the money. you will be amassed, all just plug in's. no splices or butchery , check it out, no luck to it .

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