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Message: <blockquote data-quote="MECHMAN" data-source="post: 4776764" data-attributes="member: 595065">The easy way to test an alternator is with a DC clamp meter.  Just clamp the clamp around the charge wire, and turn the system all the way up, Air conditioning, headlights, etc...   It will then display exactly how much amperage is flowing through the charge wire.Regarding your problem, I doubt very much that it has anything to do with the alternator, more likely it's a grounding problem.  If you changed grounds, or moved them around, the O2 may have lost it's ground, and the "heat" wire overheated it to the point of smoking.If your volt meter reads between 13.5 and 15 volts at all RPMs, it is not an alternator problem....check the grounds.</blockquote>

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