Does anyone happen to know how Hurricane generally wires the engine alternator to the Batteries when you have dual batteries through a battery switch? The reason for the question, is that if they are wiring it through the battery switch, then the only battery that would be charged would be the one that is switched on at the time. Most of us that have dual batteries, use only Battery 1 or 2 in order to have the other as a back up. But if only one is being charged at a time, that back up plan would be rendered useless because the back up battery might be dead if it was not being charged. If the Alternator is wired around the switch to both batteries, then the above plan makes good sense. Otherwise it would be safer to run on Both all the time so they both were getting charged. This is not clearly shown in the electrical diagram. My Boat is in Dry storage so I can't just go trace the wires easily right now.