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If you didn't have a 1/2/both four-position switch, then all the ACR would do is combine the banks when the primary bank is being charged, to charge both banks, even if the switch is not in the both position. If you connect a wire to a terminal on it... it will combine the banks if either bank is being charged....which is how I have it setup.
However, without a four-position switch, you can't combine the banks, in the case of dead starting bank.
The ACR has pots that you can set on it to adjust the charging voltage trigger level and the voltage at which the batteries isolate at.
As hellosailor said...there are also terminals on the ACR which will force combining or isolating the banks.
There is a new, smaller type electrical switch that might be a nice choice for you PB. It only has three positions IIRC... Off, start and combine. It is a good deal smaller than a traditional four-position switch.
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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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