2014 GMC Sierra Alternator Output Question 5.3L/45k miles

Redroadster

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Have been told by 3 different shops that the alternator amp output is 15.3 +/- and the alternator should be replaced. The dash gauge had been reading slightly past 14 in the 15 amp range. Just replaced the original battery. Amp reading today is right at 14 and within the "normal" operating range according to the gauge. Seems like the alternator is functioning properly and doesn't need to be replaced. Thanks for any and all input
 


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