How do you replace alternator belt on 1999 Nissan Pathfinder?

To replace the alternator belt on a 1999 Nissan Pathfinder, first, disconnect the negative battery terminal. Loosen the tensioner pulley by rotating it counterclockwise with a wrench to relieve tension on the belt. Remove the old belt and install the new one, ensuring it follows the correct routing. Finally, re-tighten the tensioner pulley, double-check the belt alignment, and reconnect the battery terminal.