If you can afford it, try to find a local RV repair service that can restore your rig's 12 volt DC power system. It should include two 6 volt RV "house" batteries connected in series for 12 volts, a battery converter/charger that converts 120vac "shore power" to 12 volts DC to power your interior lights and furnace blower and electronic appliance controls as well as to charge your house batteries, and a device to connect your chassis alternator to charge your house batteries when you are driving/running the engine. If you have an RV generator installed, the system will connect the AC 120volt generator to your converter/charger so that the generator will charge the RV batteries and provide 120 volt AC to operate your roof Air Conditioner, microwave oven and other 120vac items while it is running. The above describes a typical Class C motorhome electrical system and how it works.
