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.
Seized component that’s not allowing crankshaft to turn (bc it’s attached to the crank via drive belt) has a unique sound or characteristic when you try to start car. IF that’s what’s happening it’s most often a clutch-style AC compressor locked up. I’ve not known alternators to be able to lock up that hard. Troubleshooting this is seeing if it starts with the serpentine belt removed. Hydraulic belt tensioner, apply constant pressure and they slowly release.