Alternator: Description and Operation

The generator is belt-driven by the engine. It is serviced only as a complete assembly. The generator produces DC voltage at the B+ terminal. If the generator is failed, the generator assembly subcomponents (generator and decoupler pulley) must be inspected for individual failure and replaced accordingly.

As the energized rotor begins to rotate within the generator, the spinning magnetic field induces a current into the windings of the stator coil. Once the generator begins producing sufficient current, it also provides the current needed to energize the rotor.

The Y type stator winding connections deliver the induced AC current to 3 positive and 3 negative diodes for rectification. From the diodes, rectified DC current is delivered to the vehicles electrical system through the generator, battery, and ground terminals.

Excessive or abnormal noise emitting from the generator may be caused by:
- Worn, loose or defective bearings
- Loose or defective drive pulley (2.4L) or decoupler (3.3/3.8L)
- Incorrect, worn, damaged or misadjusted drive belt
- Loose mounting bolts
- Misaligned drive pulley
- Defective stator or diode
- Damaged internal fins