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  1. #1

    Default Alternator bearings Bad?

    Hi. Recently on a road trip I noticed that I was getting this whining noise whenever my foot was on the gas. I thought it was the tac stepper motor going bad. The noise is getting louder daily. I think that my alternator bearings may be bad. I took the belt off and spun everything by hand. The only thing that sounded bad was the alt. Here is a video of it. I am sorry that it is not the best sound quality. Please let me know your thoughts. Thanks

    1995 Silverado 4x4
    6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
    4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge

    2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system, Russell Braided SS brake lines, PowerStop Brake pads, PowerStop cross drilled and Slotted Rotors,
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

  2. #2


    Hard to tell. but from here it sounds ok.

    Usually, the idler pulley is the bearing to go, followed by the tensioner bearing.

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

  3. #3


    Quote Originally Posted by RayVoy View Post
    Hard to tell. but from here it sounds ok.

    Usually, the idler pulley is the bearing to go, followed by the tensioner bearing.
    I replaced the alternator today and the whine is gone. They sounded pretty crunchy!

  4. #4


    trying to find the "thumbs up" smiley, but not there.

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