Generally, the generator's starter is connected to the house battery. That way, the vehicle motor and the generator are not on the same battery, so a single dead battery can't kill all starting. If on separate batteries, a dead house battery, you can still start the RV, and a dead chassis battery, you can still start the generator. Both of those options allow battery charging to reclaim the dead battery.
Matt_Colie wrote:
There should be nothing on the main engine (chassis) battery that is not directly related to the main engine.
With the exception of the automatic step. That should also be on the engine battery. That way, even with the house battery disconnected, the step can still retract when the engine is started.
