I wasn't sure if you had a transfer switch, but yes, that could be a point of failure.
It will be labeled like the picture.
You will test each input side AND the output side (load or RV circuit breaker panel)
Shore, Generator and load
L1-HOT to ground =
L2-HOT to ground =
L1 to neutral =
L2 to neutral =
Neutral to ground =
BE VERY CAREFULL !!!!
TAKE YOUR TIME
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