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Location: Green Bay, WI | Hence my recommendation for the OP to simply install another battery in a tray next to the first, and only use it to start if needed. Of course he could always power various circuits from it, but then it might not be as strong if it is ever needed to start the engine. But there's nothing wrong with the plan you outlined, as long as a guy remembers to charge the thing, lol.
But the "right way" to do it would be to install two batteries and an ACR device. Then the batteries can each power their respective circuits and the alternator will charge them both in turn (depending upon their voltage level), and each will be protected from excess draw down of the other battery.
It's certainly more expensive to install two batteries and wire up an ACR system, but it isn't difficult. Perhaps the difficult part of the installation is finding enough open space to install the hardware...
TB
Edited by tcbetka 4/24/2009 6:54 AM
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