Be sure the Trailer has a Good Ground from the vehicleJust the Hitch will not always Ground the TrailerYou may have to attach a Extra Ground from the Trailer to the Truck
Try running a Good Ground from the Truck to the Trailer frame & try
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If the Truck Lights are not affected & just the Trailer Lights go off, then there is a miswire, gorund or bulb issue in the Trailer
will OPT OUT & see if someone else has the wiring
I know that the wiring is correct; however, if what you are saying is that the only other possibility is the ground, I will replace all the ground wires and make sure that they are good. If this solves the problem, I will gladly accept your answer. I should know soon after lunch.
I ran a new ground to each light from the frame of the trailer. I ran a ground from the frame of the truck to the trailer as well as the white ground harness wire. My ATV trailer worked fine on the old truck end of the harness, but I decided that it might be the problem, so I wired thenew truck harness from the trailer light package in hopes that it would solve the problem; however, when I apply the brakes with the lights on, the trailer lights still go out, but not on my ATV trailer.
When I test the light sockets after applying the brake, I get nothing anywhere on the trailer, but before applying the brake, I have lights everywhere. The brake light works without the lights on, and the lights work without the brake on. Therefore, I know that it is not a bulb issue. All grounds have been replaced and are attached to bear metal on the trailer frame as well as the truck frame.
Sorry about the delay, but I had to work today. I moved the test light to the frame of the trailer where the ground bolt is and I am only getting 4 to 6 volts from the three lines from the truck.