Intermittent squeak

[BigBoy2500]

I have an intermittent squeak that is mostly only there when driving. I’ve already changed the belt since it had never been changed. I suspect either the idler pulley or the belt tensioner. I attached a video of it. Thoughts?

 

[Rockcrawlindude]

I didn’t really hear it in your clip probably just my audio.

Don’t know if it’s the same, but my wiper mechanism squeaks over bumps, even when I’m not using them. I finally figured out what it was when I actually did use them and they made the exact squeak. The fix for mine is to keep them lubed and relube the arms when the squeak returns.

 

[BigBoy2500]

SOLVED: It was the tensioner. It wasn't holding enough tension on the serpentine belt. The truck has a little over 110k miles on it, and the belt was slipping just a tiny little bit. All of the pulleys are good.