How do you tighten fan belts on a 1985 Toyota pickup truck?

To tighten the fan belt on a 1985 Toyota pickup truck, first, locate the alternator, which is typically mounted on an adjustable bracket. Loosen the mounting bolts on the alternator slightly, then use a wrench to adjust the tension by moving the alternator away from the engine. Once the desired tension is achieved (about 1/2 inch of deflection when pressed down), tighten the mounting bolts securely. Finally, double-check the tension and make sure the belt is properly aligned on the pulleys.