Generator DECOUPLER Pulley: Operation
WARNING: This page is about a different car, the 2006 Dodge Grand Caravan, 2006 Dodge Caravan, and 2006 Chrysler Town & Country. However, it is still accessible from the selected car via links, so may be relevant.
The generator decoupler is a one way clutch and should be replaced as an assembly. It is designed to help reduce belt tension fluctuation, reduce fatigue loads, improve belt life, reduce hubloads on components, and reduce noise.