A loose alternator belt can cause low voltage throughout the vehicle's electrical system, leaving many electrical functions improperly operating. The belt needs to be tight to turn the alternator at a speed fast enough to generate the correct voltage to power the electrical system. Most novice mechanics can adjust the alternator belt in a few minutes with a few basic tools. While adjusting the belt, inspect it for any signs of excessive wear or cracks and replace if necessary.
Pull the hood latch release lever. Open the hood and support it by placing the hood prop into the appropriate hood prop hole.
Loosen the alternator pivot bolt, located on the side of the alternator, with a socket wrench.
Loosen the alternator lock bolt, attaching the alternator to the alternator bracket, with a socket wrench.
Turn the adjusting bolt, located under the alternator and accessible from the front, with a socket wrench to loosen or tighten the alternator belt. Turning the bolt clockwise will tighten the belt, while turning it counterclockwise will loosen the belt.
Tighten the alternator lock bolt, attaching the alternator to the alternator bracket, with a socket wrench.
Tighten the alternator pivot bolt, located on the side of the alternator, with a socket wrench.
Remove the hood prop from the hood and close the hood.
