Sounds like you have lost one or both of your phases in your new shorepower connection.
- If 50a, check both phases in the shorepower outlet with your voltmeter.
- If 30a, check the single phase. Then check that after you put your dongle on (30a to 50a), that both phases are coming out of dongle.
- If problem not identified, then take the cover off your circuit breaker box, and check that both phases on your main circuit breaker are present.
- If not, then problem with your shorepower cable, or transfer switch.
If you don't have a Progressive EMS that ensures good shorepower, then you need to get one.
DaveB, Raleigh, NC
2015 Tiffin RED 33AA, w/Honda CRV
VMSpc, Magnum BMK/ARC50