If the brake and backup lights on the trailer work then the problem could be in the Bargman connector itself, check the pins and the socket. If you have voltage to the car end of the connector start working back along the line into the trailer. Somewhere something has come loose or broken.
A favorite place for problems are the wire nuts TM uses. Take them off, inspect for corrosion and replace with new. If your handy, solder the connector. There are also some much better connecters that you can buy that are waterproof crimp on type.
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