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Due to emissions and mileage regulations signed by the doof in charge in 2012, we now have idiocy like "smart" alternators.
It will read 12 when not charging and 13 or 14.5v when charging the system. It charges as needed, hence what u are seeing.
If u never see it go up to 14-14.5, either your gauge is messes up or it really is not charging.
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