Mark, couple of thoughts. First, I understand wanting to move all possible weight forward and agree with that. Based on your diagram I’m not sure where the ARC switch is located but I’m assuming in the stern as the engine harness kinda dictates that and changing them to a large gauge wire for longer runs would be required and might not be doable? Second, make sure you check the spec on the negative bus in the bilge if you are reusing one. You are going to be running main grounds through it and then up to the battery’s, it may be handling more AMPS than just grounds for pumps etc...? Just make sure you gauge all of those battery cables large enough with those long runs from the Net bus/pos bus/ARC in the stern(depending on how you are doing it?). 12V is sensitive to voltage drops and you also don’t want melting wires, lol. As for venting battery’s in the cabin? That’s a tough one as you also have a burning heating system in the cabin. Safety first on a boat? You will have to make that call? I’m sure I’ve told you stuff you already know but thought I’d give you my 2 cents as they say.
