I have a 1997 Georgie Boy Pursuit Class A motorhome that I bought used in December from an individual. I've lost his contact info, so I'm struggling with a question. None of the interior lights, water pump, etc. will work unless I'm plugged-in to electrical power, or have the generator running. I have 2 batteries, so I assume there is some way to switch to battery power, but I can't figure out how. I don't want to have to fire up the generator just to flush the toilet Any thoughts?