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Above right: The item that usually fails on alternators is the drive end bearing. The quick test is to spin the alternator. If it growls, the bearings are most likely bad. You could rebuild it with new bearings, but you’ll need the correct external Torx fastener socket. Buy a used alternator ($25.00), the tools ($30.00), and new bearings ($27.00), and you will have as much invested as the cost of a rebuilt alternator from Rock Auto. A rebuilt CS130 from Rock Auto can be found for $80.00 without a core charge, but remember there are shipping charges.