Not sure what you're trying to accomplish. If you just want the batt. to stay up in storage with no power to anything in the rig, discon the neg cable and stick a
good trickle charger on the batt. Simple. If you're wandering whether the batt charges when you're hauling or when you're plugged in to SP, it does. You DONT want to discon the batt when your traveling or your frig, 12v pump,
and emergency stop switch no-workie, and that could be....unpleasant.