Never leave it in the both position as this leaves the possibility that both batteries can be discharged if you accidentally leave something on. I turn it off on my boat. The bilge pump float switches are directly wired to the batteries so they will still operate if needed.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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