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trailer light trouble.

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Best way to check if trailer lights are giving trouble. Is buy another vehicle side plug. Connect all wires EXCEPT GROUND together. Now you have all hot leads connected together and ground is separte. Get a battery and connect white wire to ground and the other wires to hot of battery.
You should have all your lights lit. If you do then you have vehicle side trouble, and it could be a ground problem. Good luck Trolling Motors Unltd.