An alternator on any car is not a part that has any kind of defined life span nor is it considered a part that requires replacement, inspection or preventive maintenance on any schedule. The built-in regulator or the diodes can fail anytime. The bearings and windings can last the life of the car.
You can drive over to an Advance Auto or similar store where they will test the battery/alternator system for free, only takes a minute. I would not go on a weekend if they are busy.
You could also inspect the brushes and make sure they are not badly worn down.
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David Hunter
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