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the output of the alternator is not sufficient for the job
could be a faulty regulator , drive belt adjustment
have the unit bench tested and check that the replacement alternator had the same amp capacity ir better then the replaced unit
The cars today do not have belt adjustments they have what is caller a idler pulls that keeps a serpintine belt "all in one belt" that snakes around all the pulleys,thus the serpintine..name..anyway if it is slipping most likely the belt needs replacing or the idler itself is bad..neither can be adjusted..the fix is replacement...your car should have a belt route under the hood showing where it goes and the idler is spring loaded and easy easy to take the pressure off to take the old belt off and replace it..not a big job for garages if you wish not to DIY .good lucK
2002 Windstar has a 3.8 litre engine, on this engine there is an automatic belt tensioner. The tensioner pulley is a the small one under the power steering pulley, yes, it's that small one way back there that is hard to get at. To remove the belt you would use a 15mm wrench on the belt tensioner pulley nut and rotate counterclockwise, when released it automatically tensions the belt, if you are hearing a squeal, look at the belt carefully and try to determine if it is running straight or one of the pulleys might be a little out of line causing the belt to lean away from its straight run. The problem here is usually the belt tensioner assembly is worn and needs replaced ( the whole assembly ) along with a new belt.
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