Most of the 1/2/both/off battery switches I've seen are rotary and can go from 1-both-2-off or 1-off-2-both... I prefer the Dual Circuit plus design, which reduces the problem, but you do need either a battery combiner or echo charger with it.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.