This is a 120A Bosch Internal Fan Alternator for the 1999-04 Volvo Models. This Unit Uses a 6-Groove Conventional Pulley. The Thick Mounting Ear Does Not Have the Usual Hole Through It, But Rather Has 2 Mounting Holes Drilled on the Flat Side of It. The Rotor Threads (and Rotor Nut) are Left-Hand, Rather Than the Conventional Right-Hand Thread (the Alternator is Designed for CCW Rotation). This Unit Looks Like the 13801, Except With Different Internal Parts, the 13801 Uses a Clutch Pulley.
There Seems to Be Some Confusion in the Voltage Regulators Used as OE Cores of the 13801 and 13802 Have Both Been Seen Using Regulator #F-00M-145-229, Yet Later OE Information Shows Different Replacement Regulators for Each. At This Point the Regulators Shown Will Match Those Seen on the OEM Units.
In 3/08 We Broke Out the 0-124-525-018 and Designated it as 220-5047C, as it Has a Conventional Pulley Like the 13802, But Uses the Regulator From the 13801 (According to the Manufacturer).