If there has been a problem with AC leakage from other boats then completely disconnecting all grounds might help. No idea, just guessing. The battery charger would need to be connected directly to the battery(s), which looks like it is from the pictures.
Michael Brown Windburn C&C 30-1 Date: Tue, 1 Aug 2017 07:35:58 +0000 (UTC) From: RANDY <randy.staff...@comcast.net> Scratching my head. Presumably the point of the second battery switch is to switch some circuit(s) open or closed. But to me it's weird. I'd generally expect the switching to be on the hot side of the circuits, and all grounding to be (unswitched) to the engine block and therefore the prop shaft. (Not that I'm all that experienced with boat electrical systems). Where does the black cable off the "common" stud of that second battery switch run to? Regarding the #1 battery, an easy test to isolate battery fault versus other faults would be to connect it to a known good charger (only). If it won't charge up or hold a charge, it's the battery. Cheers, Randy
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