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Sounds like someone INTENTIONALLY wired up the charger to the output side of the A/B switch, so they could use the existing switch as a way of shunting the charger to A/B/Both and selectively charging.
Which produces the "unsafe" condition of having live DC circuits when the battery switch is supposedly OFF.
I suppose that's a valid kludge, but if you really want that kind of selectivity...a second switch and some cables might be a better way to do it. Break out another hundred, I suppose.
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