Yep, or a failing alternator bearing. Could be causing that too. Pulleys dont just go out of alignment unless there is a failure or it sucks up a big rock somehow.

rjp

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03 540I (GAK!!)
81 280E (W123)
70 LeMans Sport with pissed off Poncho 462"
1989 Silverado Step Side (under the knife- complete restomod)