How do you adjust the alternator belt in a 2001 altima?

To adjust the alternator belt in a 2001 Altima, first, locate the alternator and loosen the mounting bolts that secure it. Then, use a wrench to turn the adjusting bolt or tensioner to increase or decrease the tension on the belt. Ensure that the belt has the proper tension by pressing down on it; it should have about half an inch of play. Finally, tighten the mounting bolts securely once the desired tension is achieved.