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Old 12-05-2012, 09:17 PM
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drive by72 drive by72 is offline
I feed trolls
Location: Snowy Wisconsin
 
Join Date: Nov 2010
Posts: 4,960
Mein Auto: 3 series
Randy, try spraying water on the serp belt when its whining. If it goes away, then its the belt either not tensioned correctly or bad belt. I dont think its that though.

One way to tell if its the alternator bearing starting to go is drain the battery slightly. Headlights on for a few minutes, blower motor on high. Keep lights on, turn blower off so you can hear, and when you start it throttle it to ~2k. Usually they'll squeal under increased load if the bearings are starting to go
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Please, call me Chadley

1997 328iS... HR coilovers, Brembo F40 calipers, camber plates, it needs a CUMMINS!!

1990-somethin Chevy K3500... Twin turbo Cummins swapped Chevy, dana 60 front axle swap, 4 link rear, air ride, custom everything. 600+ hp, 1296 ft lbs tq