https://www.youtube.com/watch?v=4XJT91-kP2A
[h=1]Alternator - How to test using a Voltmeter[/h] 277,312 views
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Moss Motors, Ltd.
Your Moss tech, Hans, is back once again to talk about how to test your Alternator. You will learn how to check for correct voltage at the alternator and diagnose if a diode has gone bad internally.