Originally Posted by Rsimier
Cool thank you. That battery power switch is on but I still don't have power for the generator to start or even to turn on the light.
Loose/corroded connection(s), bad batteries, bad switch. Try jump starting the generator? Might be a bad battery isolator keeping the vehicle from putting a charge into the house batteries. Based on the fact nothing works even with the engine running I would start with the isolator, it supposed to allow power to run to the coach batteries, but not back to the engine battery, to keep it from getting run down. It is also to act as a safety switch when you hook up to shore power to keep the generator from back feeding the power pole. Here is a link to a video on the basics of how to test one
It is based on a marine system with dual battery banks, but the process is similar.
Any of the above is a possibility given the age of the unit. Did you buy from an individual or dealer? If dealer; I would be headed back there and make them check it out. Personally I think it stinks that they didn't show you that everything worked prior to your purchase.