I would check the socket with a volt meter. If no power then pull the fixture off the camper and check for voltage there. Hopefully there is power there and you can repair it by fixing connections or replacing the fixture.
If there is no power at the back of the fixture... The wire should come from another marker light on the back. If they work, somehow the wire going to the left marker is not connected to on the other end. I would then go to the nearest marker and see if there is a wire there that goes to the left marker and fix the connection. If not there, then go to the next closest, etc.
Good luck. Electrical issues cam be difficult without prints.
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