Try improving the connection of the main ground wire of the trailer wiring harness. Make sure it is attached to a clean metal surface. Or you can run all of the trailer wires back to the main ground. This is actually the ideal solution. But you can also check the current grounds for the lights to make sure they are making a solid connection to a clean metal surface. The pins of the trailer wiring connectors should be checked an clean as needed too.
What you described is the classic insufficient... view full answer...
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