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If you have replaced all this it may not be a belt. It may be your alternator itself. These have bearings inside them and they do wear out. The only way to check is to remove the belt and spin the alternator to see if that is what is noisy. It may wobble if the bearings are bad. It should turn smoothly if not.

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15y ago
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Q: How do you repair a high pitched squeal on a 1997 blazer sound almost like locusts I already replaced tensioner ac compressor and actual serp belt?
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