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			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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