How do you change alternator belt on a 1988 Mazda 626?

To change the alternator belt on a 1988 Mazda 626, first, disconnect the negative battery cable for safety. Locate the alternator, then loosen the tensioner bolt and the mounting bolts on the alternator to relieve tension on the belt. Remove the old belt and install the new one, ensuring it sits properly on the pulleys. Finally, retighten the alternator bolts, adjust the tension as needed, and reconnect the battery cable.