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...it depends (no, not the kind you wear)...because GM cars since 2005 have a "fuel (fool?) saving" Regulated Voltage Control (RVC) system that backs-down the current from the alternator during daylight/light power driving, and only makes the alternator really 'work' when engine load is light or engine is decelerating. Hence, it's not uncommon to sometime see charging voltage between 13.8-14.8Vdc under perfectly 'typical' conditions.
...other companies use something similar.
Last edited by gone-ot; 08-06-2012 at 08:10 PM..
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