How do you replace an alternator belt on 2001 Mitsubishi Mirage?

To replace the alternator belt on a 2001 Mitsubishi Mirage, first, ensure the engine is off and cool, then disconnect the negative battery terminal. Loosen the tensioner pulley by turning the appropriate bolt counterclockwise, which will allow you to remove the old belt. Install the new belt by following the proper routing diagram, usually found on a label near the engine bay, and then re-tighten the tensioner pulley to secure the belt. Finally, reconnect the battery terminal and start the engine to check for proper alignment and tension.