Hold on a minute there cowboy.
Your alternator has a clutch drive, and is doing what it is supposed to do. This design is made as a gas saving measure, allowing the engine to sometimes not drive the alternator as hard as if it were hard-coupled. Go to a shop and inquire - you'll see.
More likely your problem is the regulator which is attached to the rear of the unit. You can replace that for about $75.
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