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2011 GMC 1500 battery

If my volt meter stays above 14v for a long time. At least an hour before it drops, does this men that my battery is not charging properly? My concern is that if my battery is not holding a charge, am I over working the alternator?

There is surface charge. With the car off, turn your headlights on high beams for 2 minutes. Turn them off, then check battery voltage. Or check the battery voltage after car has been sitting a few hours.