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Mazda alternator control


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I've asked the same question before, see 

So I ordered that board that Adam recommended, but it was not working, still getting 18V continuously, the manufacturer got back to me and gave me a few things to check out.

In the meantime, I've setup a GP PWM output to control the alternator field, it's stable enough under idle and light load, but I'm yet to take the car for an actual drive


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