The serpentine belt tensioner a big pulley is not turning?

2004 CHEVROLET SILVERADO
230,000 MILES • 6.6L • V8 • 4WD • AUTOMATIC
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JJ2SHARP
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Below serpentine belt tensioner a big pulley isn't turning?
May 8, 2023 at 12:27 PM
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STRAILER
  • ✓ASE Certified Mechanic
  • 54,832 POSTS
  • ASE Certified Mechanic
Going to need more details, an image or something to go on. I have uploaded some images for the belt systems so it can make it easier for you to identify. Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.
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Professional Diagram for 2CarPros Members
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Professional Diagram for 2CarPros Members
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May 8, 2023 at 5:43 PM
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