My dh is camping right now. He had his RV hooked up to shore power for the last few days. But now it seems that the batteries are drained according to the battery level gauge (plus the water pump dims...
A 12 volt water pump,fridge and furnace WILL NOT work plugged into shore power if the batteries are dead! The only thing that will work are the 110 volt wall receptacles. Disconnect your battery pack, clip the battery charger to the ends of the RV battery cable. + to + - to -. Plug in charger to shore power or gen. All 12 volt accessories will start working again. Sounds like a bad converter or batteries. FYI I'm up the hill in Grass Valley.