Thanks to everyone for your replies. I finally got tired of looking for the solenoid and took the old RV to the local RV repair shop. Turns out the previous owner had rewired the 12 volt system to bypass the converter (who knows why!) so the auxiliary battery wasn't charging. I really don't understand the mechanic's explanation because the 12v system worked OK for me for 2 years before it inexplicably broke down. And the mechanic says there is no battery disconnect solenoid in this old model. Go figure. Anyway, everything is fixed and works correctly now. Thanks again!
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