Vintage RV upgrades

If you don't already know this, TYPICAL Class C electrical power is fed into the RV's "housebox" electrical system via cable plugged into 120vac camp power which feeds a "converter/charger"device which charges one or two deep cycle "house batteries" which in turn power the 12 volt DC interior lights and 12 volt appliance controls, the fresh water pump and the furnace blower. When the RV generator is running, it takes the place of the camp cable 110 vac hookup supplying 110vac power to the electrical system. When the RV's engine is running, it's alternator charges the house batteries while underway. Most RV water heaters and refrigerators run on propane. Refrigerators and microwave ovens also run on 110 vac when RV is on camp power or RV generator power. Furnace blowers draw considerable 12 volt house battery current and may run house batteries down in one night's use. Otherwise, house battery power may run interior lights for two to three nights if in good condition. Two day camping and a few hundred miles driving usually keeps house batteries charged and interior lights working.