At first we thought it was the battery, replaced it after we checked (it was no good even after sitting on a charger), then thinking it could be the alt, so I wanna take the belt off to check. One issue, the tension is insain. I’m not sure what I can do besides either try loosening the alt first then tension or just cut the belt, which doesn’t need to be changed.
Ion know man.
Rule 8 - make and model.
It’s difficult to help you much if we don’t know what we’re taking about.
But most likely, you have some sort of tensioner system. Either a spring loaded pulley. Or a manually adjusted pulley. If you don’t know how to undo the belt tension on your vehicle, I don’t think I’d recommend taking the alternator off either. I’d be worried you’d crank down those bolts too hard and snap them.
If you insist on doing this work, Watch some videos specific to your vehicle. Get a service manual. Get a torque wrench, know how to use it, and know where to find torque specs.