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A double pole on off combine battery switch like this one is a great choice for a single engine two battery boat wiring system i allows your house and start battery to remain isolated except for emergency conditions. Step by step rv battery wiring warning you may not copy or reproduce my video or any part of it without my consent. It doesnt matter how big the lead acid cells are they will still only produce 25 volts you can see this for yourself if you compare a standard rv marine 12 volt battery to a standard 6 volt golf car battery the two batteries are ruffly the same size and weight but the 12 volt battery has 6 cells while the 6 volt battery three. How to wire a 12 volt electrical system in an rv use a battery isolator to ensure the chassis system cannot be depleted by use of the coach systems equipment a battery isolator prioritizes charge from the running engine to the chassis battery then switches charge to the coach battery but prevents the house systems from drawing on the . The starter solenoid has a separate function and isnt related to the installation of your house battery solenoid a starter solenoid is only energized while you are starting the engine and while the engine is being turned over by the starter the house battery solenoid needs to be energized all the time while the engine is running