Bosch AL0839X Alternator

Bosch AL0839X Remanufactured Alternator

Bosch AL0839X is a remanufactured 12-volt alternator built for charging-system performance and dependable electrical output. It is designed for BMW applications that require a 110-amp unit with a 6-groove pulley and internal regulation.

Bosch Premium Alternators are remanufactured, tested, and built to deliver consistent operation in demanding daily driving conditions. This Bosch alternator supports BMW 128i, 328i, 528i, X3, and related models listed below.

Key Features

• Remanufactured Bosch alternator for 12-volt charging systems
• 110-amp amperage rating for stable electrical supply
• Internal regulator with external regulator included
• Internal fan design with external fan included
• 6-groove pulley included; 55 mm outside pulley diameter
• Clockwise rotation
• Aluminum case and aluminum case color
• Plug type 463 with rear-view plug clock position at 6 o’clock
• One-wire capable: No

Detailed Description

The Bosch AL0839X alternator is a remanufactured replacement part for BMW charging systems that call for a 110-amp, 12-volt alternator with internal regulation and a 6S-CP pulley setup. Bosch remanufactured alternators are built and tested to support reliable charging performance, helping maintain battery charge and electrical system stability in vehicles with higher accessory demand. This part number, AL0839X, is also referenced for BMW OE applications and cross-references Bosch-style replacement needs for the same fitment group.

Compatible With BMW 128i, 328i, 328i xDrive, 528i, 528i xDrive, X3, 323i, 328xi, and 528xi applications listed in the fitment data. Fits 2008-2013 BMW 128i, N/A; Fits 2007-2013 BMW 328i, N/A; Fits 2009-2013 BMW 328i xDrive, N/A; Fits 2008-2010 BMW 528i, N/A; Fits 2009-2010 BMW 528i xDrive, N/A; Fits 2007-2010 BMW X3, N/A; Fits 2008-2009 BMW 323i, N/A; Fits 2007-2008 BMW 328xi, N/A; Fits 2008 BMW 528xi, N/A; Fits 2007 BMW 323i, N/A.

This part cross-references Bosch OE numbers 12317550967 and 12317551254 for the same application.

What It Helps Address

• Battery warning light caused by weak charging output
• Dim lights or fluctuating electrical performance
• Low-voltage conditions during idle or accessory use
• Charging-system failure from a worn alternator
• Voltage instability in BMW electrical systems

Installation Notes and Tips

Verify pulley style, plug type, rotation direction, and amperage rating before installation. Confirm the vehicle’s alternator specification matches the 150-amp-or-lower application notes shown in the fitment data for your BMW model. Inspect the belt condition, electrical connectors, and charging cables during replacement to help ensure proper system operation after installation.

Quality Assurance

Bosch Premium Alternators are designed, built, and tested for performance and reliability. This remanufactured AL0839X alternator reflects Bosch’s charging-system engineering standards for BMW applications.