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Not the alternator coupler at all. There are two bearings on the tensioner. One for the roller for the backside of the belt and the other for the spring that hold the belt tight. Well it's the bearing that rotate with the spring that vibrated forward allowing the outer half of the tensioner to scrap up against the power steering pump pulley. Because of that interference the belt can jump off because it jams too loose and too tight. I caught mine before the belt came off but belt was damaged from rubbing the tensioner arm because tensioner was out of alignment. I still have the old one and can take pictures and post if needed.
Edit: Since I replaced my tensioner, I put 1,000 miles on it and it runs smooth. If the alternator coupler was bad I would replace the alternator for the vehicle has 100,000 miles on it. Yep I replace the timing belt too at the same time.
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