New converter issue

[Looper]

Just wondering if this rings a bell to anyone else who has changed an inverter...
I had my old hummer of a converter changed out at an RV dealer and didn't use the trailer since (almost 2yrs) Now I plug in trailer to shore power and refridgerator, furnace and water pump aren't working, along with tank monitor panel.
Anyone have any advise on what to check?
Oh yea..1978 Sovereign rear bedroom
Thanks,
Looper.

[RM66caravel]

If it worked after the change out and before the layup then I would check the fuses and circuit breakers! Next signs of rodent damage ie chewed wires! After those check out turn all of the circuits off and the converter on and check each 1 at a time. Just my opinion.
Cliff