New alternator whining/supercharger noise.

Discussion in 'The Garage' started by 94 Silverado, Jun 30, 2020 at 8:09 PM.

  1. 94 Silverado

    94 Silverado OBS Enthusiast

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    I bought a NEW Duralast Gold 105A alternator to replace the factory one that had 167k miles and started squeaking. The new one seems to have a whine to it. It's not crazy loud but I notice it at idle and deceleration. Is this normal for these trucks or did I get a bad part?
     
  2. Madscientist

    Madscientist I'm Awesome

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    I have noticed this with new alternators. It seams to go away in about 1000 miles.
     
  3. Busted Knuckle

    Busted Knuckle OBS Enthusiast

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    I may have the same alt. Whine after startup to replenish the battery drain and then is quiet. If its charging OK I wouldn't worry. Decel whine is unusual and I'd suspect something else. I've got new whines after replacing the transmission mount. Nothing is wrong.
     
  4. Erik the Awful

    Erik the Awful I'm Awesome

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    I've put four alternators in my Mustang. The cheap ones were quiet, but crapped out after a year. The expensive ones whined, but lasted two years. I think it's all made by the lowest bidder in Bangladesh, boxed in China, and labeled in California.
     

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