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There are only really two wires needed for the alternator to work.
The main battery lead (big wire) from battery to alternator I leave alone. If you unhook the Yellow/black which goes from the key switch to the alternator, and start the car, the alternator will not charge.
If you then give power to the yellow/black, the alternator will start charging. I have not tested to see if you shut the power off to the yellow black if the alternator will keep charging.
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