Changing inside pully belt

it sounds belt related. i am not sure if this vehicle has a seperate belt for the ac compressor, but if so, it sounds possible that the compressor seized and tore the belt off. have a look

you shouldnt have any allignment issues, assuming that the pully is good. if it needed to be replaced, you would know it. you would hear all kinds of odd noises...but my guess is that when the tension was put back on the belt, it was overlapping one of the edges on a pully farther down. just take a close look at where the belt is routed, and make sure that it is on its track on every pully. if not, release the tension, reallign, and tighten up again.

What are you removing? alt? power steering?
Belt Tensioner Operation: This device functions as an idler pulley and is located on either the inside or outside of the accessory drive belt. Its provides the correct tension for initial belt adjustment and maintains this critical tension adjustment during vehicle operation. It can be found on conventional V-belts and the newer serpentine ribbed belts.

the air conditioning compressor is driven by the crank and that drives tha alternator. you have to take off all the belts in order to change the alternator belt.

Belt