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Battery Master Switch

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Mons Meg View Drop Down
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Joined: 04 Mar 2016
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Posts: 3
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    Posted: 02 Mar 2020 at 7:03pm
A quick question for the electrical boffins.

My boat, built in 1979 for a very exacting engineer, has the battery master wired in on the negative side of the circuit. I’m about to fit a shore power battery charger capable of charging two batteries simultaneously but, if I connect the charger's common negative terminal to both batteries, this will bypass the master switch's ability to isolate one battery from another.  After conducting a little research it appears that the norm is for the master switch to be on the positive side of the circuit and that I ought to rewire accordingly. Before I do, does anyone know why my boat may have been wired this way?
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