[RayChez1]

The engine alternator charges the chassis batteries first, once they are charged then the bi-directional relay will start charging the house batteries.

Now to jump start the engine with the house batteries just press the rocking switch down and hold it for a few seconds and it will crank right up.

Now while I am hooked up to shore power only the house batteries get charged up with the inverter/charger on my Scenic Cruiser.