Diesel Place : Chevrolet and GMC Diesel Truck Forums - View Single Post - Alternator overcharging?
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Old 08-25-2015, 10:57 AM   #5 (permalink)
diesail
Diesel Ninja
 
Join Date: Apr 2009
Location: In, on or about the water, MD
Posts: 10,135

It was climbing to 14.7 because it was trying to put a charge into a bad battery. It can go that high right after startup but if it stays there for extended periods there is an issue, in your case it was likely trying to charge a battery with a bad cell.
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