You could try a 'circuit tracer' and back trace from the socket farthest from the breaker panel. Harbor freight as a cheap but OK tracer if you have a HF close by. The big box hardware stores have better ones but for the few times I use it, HF is OK and cheaper. DISCONNECT SHORE POWER AND ENSURE GENERATOR IS OFF. IF YOU HAVE AN INVERTER DISCONNECT HOUSE BATTERY. connect the tone generator to the socket farthest distance away from the breaker and start working backwards going to each socket in turn to see if you get the tone. when the tone stops you found your break. Search HF for "cable tracker" or "Circuit Breaker Detective"
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