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Angry Mastervolt Alt / Controller

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Hello hive mind,

We have a Mastervolt 28/80 (24v 80amp) alternator for our house bank connected through a Mastervolt Alpha Pro controller. Previously, it has been rock solid and no issues. This weekend, we're seeing a weird behavior where the controller attempts to fire up the alternator, then shuts off and repeats. It isn't on every startup, but maybe every few.

Changing engine revs doesn't make a difference. I, unwisely, didn't check the indicator lights, though reading the Mastervolt manual offers little insights.

Any suggestions on what might be up?

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