We're parked at home, and have been for a month or so. The coach has remained fairly level until last night. Yesterday I was working on the engine batteries and ran out of daylight so I left them disconnected. This morning the coach was quite a bit out of level. I thought the 12V compressor ran off of the house batteries, but it would seem it runs off of the engine batteries.
Anyone know for sure? I could go back and disconnect the engine batteries again, then move the stuff in the small bay to get to the compressor and see if it has power, but I'm guessing that someone already knows the answer.
On my '93 U280, the "J280-U300 Automotive Wiring Diagram" shows 12V HWH compressor powered off the coach battery set (not the start batteries). The re-setable 15 amp circuit breaker is under a white fiberglass cover in middle storage bay, near the battery charger/convertor. Might also be a in-line fuse holder right at the compressor.
There is an in-line fuse. I finished the battery work this morning, started the Detroit, and leveled the coach. I'll keep an eye on the level and see what happens.