Bosch AL0789X Alternator

Bosch Remanufactured Alternator for Mercedes-Benz

The Bosch AL0789X is a remanufactured 12-volt alternator built for Mercedes-Benz charging-system applications that demand stable output and OE-style fitment. With a 150-amp rating, internal fan, internal regulator, and included pulley, it is built for direct replacement service on select Mercedes-Benz models.

Key Features

• Remanufactured Bosch alternator for charging-system replacement
• 12-volt, 150-amp output for select Mercedes-Benz applications
• Internal fan and internal regulator design
• Clockwise rotation
• 6-groove pulley included, 50 mm outside pulley diameter
• Aluminum case and aluminum case material for OE-style construction
• Plug type 367 with rear-view plug clock at 6 o’clock
• External fan included and external regulator included as listed in product data

Product Details

Bosch Premium Alternators are remanufactured, tested charging components engineered for dependable electrical performance and consistent operation. The AL0789X is a direct-fit alternator for Mercedes-Benz vehicles including the S430, S500, E500, SL500, CL500, G500, and SLR McLaren applications listed below. This part number, AL0789X, also cross-references Bosch OE-style numbers 0121541302 and 0131548202 for the same application.

Compatible With: Fits 2002-2006 Mercedes-Benz S430, Fits 2002-2006 Mercedes-Benz S500, Fits 2003-2006 Mercedes-Benz E500, Fits 2003-2006 Mercedes-Benz SL500, Fits 2002-2006 Mercedes-Benz CL500, Fits 2002-2008 Mercedes-Benz G500, Fits 2005-2008 Mercedes-Benz SLR McLaren, and additional Mercedes-Benz applications listed in the fitment data. The Bosch AL0789X is also listed for 2003-2005 Mercedes-Benz E320, 2003-2004 Mercedes-Benz G55 AMG, 2002-2003 Mercedes-Benz CLK430, 2002 Mercedes-Benz E430, 2002 Mercedes-Benz E55 AMG, and 2006 Mercedes-Benz CLS500 and S350.

Common Issues This Part Can Address

• Low charging voltage or battery warning lights
• Dim headlights or unstable electrical performance
• Battery drain caused by alternator output loss
• Charging-system noise related to alternator wear
• Failure to maintain proper voltage under load

Installation Notes and Tips

Verify pulley style, plug type 367, rotation direction, and mounting-ear orientation before installation. Confirm the vehicle uses the listed 12-volt, 150-amp configuration and match the application to the exact Mercedes-Benz model and year shown in the fitment data. Inspect the belt, tensioner, and battery condition during replacement to help ensure proper charging-system operation.

Quality Assurance

This Bosch remanufactured alternator is built and tested to support reliable charging performance in OE-style Mercedes-Benz applications. Bosch’s Premium Alternators line focuses on remanufactured electrical components for consistent fit and function.