Remy 12939 Alternator

Remanufactured 220 Amp Alternator for Mercedes-Benz and Dodge

The Remy Premium Remanufactured 12939 alternator is a 12-volt charging component built for vehicles that require a high-output electrical system. With a 220 amp rating, internal voltage regulator, internal fan, and included pulley, it is a direct-fit replacement for select Mercedes-Benz and Dodge applications.

Compatible with 2010-2011 Mercedes-Benz S550 high-capacity applications, 2007-2009 Mercedes-Benz S550 optional 220 amp applications, 2007-2008 Mercedes-Benz CL550 optional 220 amp applications, and 2007-2008 Dodge Sprinter 2500 and Sprinter 3500 optional 220 amp applications.

Key Features

• 220 amp amperage rating for high-demand charging systems
• 12-volt remanufactured alternator
• Internal voltage regulator for integrated control
• Internal fan design
• Pulley included
• Clockwise rotation
• OE manufacturer reference: Bosch
• Remy Premium Remanufactured line for OE-style replacement needs

Product Details

Remy 12939 is a premium remanufactured alternator engineered around Bosch OE specifications for select Mercedes-Benz S550, Mercedes-Benz CL550, and Dodge Sprinter 2500 and 3500 vehicles. This unit is built for 12-volt charging systems and uses an internal regulator to manage output while supporting vehicles that call for a 220 amp alternator. The included pulley and clockwise rotation help match the original equipment configuration for the listed applications. This part cross-references Bosch (e.g., 0-121-813-001, 013-154-05-02) for the same application.

What It Helps Address

• Battery warning lights related to charging system output
• Low-voltage conditions during accessory or electrical load demand
• Dim lights or inconsistent electrical performance
• Charging failure caused by worn internal alternator components
• Replacement needs for high-output Mercedes-Benz S550 and Sprinter charging systems

Installation Notes and Tips

Verify the vehicle’s original alternator specifications before installation, including amperage rating, rotation direction, and regulator type. Confirm fitment against the listed applications for 2010-2011 Mercedes-Benz S550, 2007-2009 Mercedes-Benz S550, 2007-2008 Mercedes-Benz CL550, 2007-2008 Dodge Sprinter 2500, and 2007-2008 Dodge Sprinter 3500. Inspect the charging system, belt condition, and electrical connections during replacement to help ensure proper operation.

Quality Assurance

Remy Premium Remanufactured parts are remanufactured to meet application-specific requirements for OE-style replacement. Part number 12939 is built for the listed Bosch-based applications and is intended to restore proper charging performance in the specified vehicles.