tmaxxa: "If I ran the generator, wouldn't that be sufficient to power up any of the electrical system on the RV to check it out even if the house battery is bad?"
That is a smart move as it then also checks out the generator. Be sure to put a load on it by using the AC and/or using small heaters or hair dryer, anything that uses excess power. 15 to 30 minutes will be needed.
But using a generator does not check out things that don't use 120v when on the road or when there is no electricity. Most people would not use the generator for more than one hour at a time.
