I have a 2007 Sunseeker on the Ford 350 chasis.
When I plug into shoreline the shoreside breaker trips. Doesn't matter if I plug into 30 Amp or 20 Amp, as soon as plug prongs make contact the breaker trips.
I have turned everything I can find off including refrigerator and water heater. It still trips just as soon as I plug in.
To troubleshoot, I have flipped all coach breakers off. I can then plug in without the shoreside breaker tripping. As soon as I flip the coach Main 20 Amp breaker to the on position the shoreside breaker trips.
At no time do any of the coach breakers trip.
I disassembled the plug on the 30 Amp power cable looking for any dead short between the ground post and hot side. It was fine.
What should be the next steps? (I have tried multiple shoreside power posts at various locations including some that I know work for other campers.)