First thing I did was test the chassis battery. It was dead. Topped it off and charging it now. So, there may be two unrelated problems...or the problems may be related.
I *think* the only connections between the chassis and house batteries are the alternator-to-battery connection to charge the house batteries while I'm driving, and the auxiliary start switch...so that shouldn't affect the rest of the house power. All three house batteries are pushing 12.8v.
It's possible the generator uses the chassis battery to start, though...which would explain the generator part, but I don't see how that could explain the rest.
MrWizard - the inverter is under the bed, next to the fusebox. I don't recall seeing any inline fuses but I'll trace the path and see if I can find any. Going back out to check all the fuses in the box in a second.
Thanks everyone for the help so far!
