Instead of a complicated isolator, I am still suggesting this circuit for the DIYer. Just bring the alternator
diode AC coil connections out to a second alt bridge (properly heat sinked), and connect the second
bridge plus output to the second battery. No need for the minus connection, the one in the alternator
will take car of that. The only loses are those already present in an alternator, unlike some isolators.
Whenever the alternator puts out, the majority of current will go to the lowest battery, eventually topping
them both off and cut back by the original voltage regulator. Bruce Roe
BatIsolate.jpg
diode AC coil connections out to a second alt bridge (properly heat sinked), and connect the second
bridge plus output to the second battery. No need for the minus connection, the one in the alternator
will take car of that. The only loses are those already present in an alternator, unlike some isolators.
Whenever the alternator puts out, the majority of current will go to the lowest battery, eventually topping
them both off and cut back by the original voltage regulator. Bruce Roe
BatIsolate.jpg
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