1991 Beaver Contessa Converter / Inverter

Beavers at abt that time had a separate inverter, the converter was nearby in a separate box... usually they were under the bed ( as mentioned) on the feet side, on the left was the inverter and on the right was the converter as you faced the bed...there were also separate breakers...you may want to check them...
So if you do not have 12v for home, I suggest you follow the cables from the batt compartment, and one of the sets of cablesshould take you these boxes, usually they are close to the batts due to the high current requirements..
Good luck, and let us know what you find...
Tony