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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