GMC Sierra 2500 HD Alternator

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    Reviews for

    2011 Duramax - works as advertised


    in 5 months

    The alternator is working as designed. My old regulator appeared to be going out as the voltage would constantly fluctuate and drop below 12.5 and never go above 13.8. I have only had the trip out on one long trip. On the way going it held a steady 14.8 but on the way home it ran at 15.4 volts. I will continue to monitor as that is reaching a high point.

    What kind of vehicle do you drive? 2012 GMC Sierra 2500 HD