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Check with the installer of car audio systems. They use multiple battery
installations on the big systems. I got an apparatus that directs charge from
the alternator to whichever battery needs charge without overcharging either
one. It is called an isolator.
Most of these "isolators" are actually two sets of diodes. One feeds one battery and the other feeds the second. The sense wire for the voltage regulator should then be taken to the battery side. Therefore both batteries see the same voltage drop and they will be charged equally. It is not a particularly elegant solution since there is a constant voltage drop in the system, dissipating significant power - hence the large heat sink. It works, though.
Gary Casey
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