This will require physical inspection of the wiring. For safety don't do this while on shore power or the ginney is running. I'd start at the transfer switch although I would not expect it to switch the ground. The ground wires should be either green or bare copper. White is neutral and black is the hot wire.
Let us know what you find.
Our's has a common neutral buss near the water heater. Haven't looked at the transfer switch, but then we haven't had this problem.
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2016 Axis 24.1 E-450 6 spd tranny
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