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All Trailer Lights Blink When Truck Headlights and Turn Signals are Turned On

Question:

When I turn my lights on and use a blinker all my lights blink including my running lights.When I have my lights off and use my blinkers they work just fine.I just ran all new wiring front to back and new tail lights.The wiring from my truck is a T-one connector I bought from you last week.Boat wiring is 5 wire white,green,green/brown,yellow,yellow/brown.Truck is a 4 wire.Is this the issue..I am lost and frustrated.

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Expert Reply:

The wiring harness on the trailer side is what is called a wishbone harness. It splits the running light signal so that you do not have to run a jumper wire from one side to the other. The yellow/brown wire is for the left side running lights and the green/brown is for the right side running lights. That could be what the problem is if you wired it differently.

Make sure that the trailer lights are grounded to a clean and corrosion free location of the trailer frame. Also check to make sure the main trailer ground and the vehicle harness ground are connected to clean and corrosion free bare metal surfaces.

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