Join Date: Sep 2006
Thanked 11 Times in 11 Posts
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I use one one charger and one 3-step regulator, and switch manually. Protect your alternator diodes with a battery master designed to disable the alternator field wire before you switch.
It is simple and it works fine.
Battery internal RESISTANCE determines the battery draw when charging. A discharged battery has less resistance, and so draws more current, slowly falling off as the battery resistance recovers.