Look at the fuses on the tow vehicle.. Some times they are inside the vehicle, sometimes under the hood... Look for trailer running/parking lights. Thats if it's not at the plug connection or bad brown wires. Your ground must be fine for the brakes to work correctly. Thats a seperate circuit.
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Marks Props 317-398-9294, 1850 East 225 South, Shelbyville, Indiana 46176 propellerman59@gmail.com http://www.marksprops.com/index.html