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1- You need not only a switch for isolation but a big fuse as well. This is to protect your boat as per ABYC recommendation. In case of shorts, alt draining current during unattended period, etc... The only exception would be a shore charger. You need to have means to isolate your batts, Benes for instance switch not only positive, but ground as well, for total isolation 3- I'm assuming your volt sensing is wired internal to your alt, so there is only one wire leaving the alt. If that's the case, then you're sensing the house batt to decide about current output and that would create some volt gap against your engine batt, wich is the one where Yanmar takes reference for all electronics (solenoid, panel, alarms, etc ...). I'd use a separator for both banks, or attach the alt sense wire to the engine batt. Another option is to swap engine <> house on you drawning.
Beneteau Oceanis 43
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