How to change alternator belt for Toyota Previa 91?

To change the alternator belt on a 1991 Toyota Previa, first, ensure the engine is off and cool. Remove the engine cover if applicable, then locate the alternator and loosen the tensioner bolt to relieve tension on the belt. Slide the old belt off the alternator pulley and replace it with the new belt, ensuring it is properly seated in all pulleys. Finally, adjust the tensioner to tighten the new belt and secure the tensioner bolt before reassembling any removed components.