Valeo 439398 Alternator

Valeo 439398 Alternator for BMW Charging Systems

Valeo 439398 is a 12-volt alternator built for BMW charging-system applications that require a 120-amp output, internal regulation, and a serpentine-belt pulley setup. It is a Valeo OE family unit with an aluminum housing and clockwise rotation for direct replacement use on select BMW models.

Key Features

• 12-volt alternator with 120-amp amperage rating
• Internal fan and internal regulator for integrated operation
• Clockwise rotation direction
• 6-groove pulley for serpentine belt systems
• Aluminum housing for OE-style fit and durability
• Valeo OE family construction
• Technical number SG12B029

Product Details

As part of Valeo’s alternator line, part number 439398 reflects the company’s long history in electrical systems and OE supply. This alternator is a 100% new unit, which helps avoid the wear concerns associated with reused components. It is engineered for BMW charging-system service where stable voltage output and correct pulley alignment are required. This part cross-references Bosch AL0703N and AL0703X for the same application.

Vehicle Fitment

• Fits 2001-2006 BMW 325Ci, N/A
• Fits 2001-2006 BMW 330Ci, N/A
• Fits 2006 BMW 330i, N/A
• Fits 2006 BMW 330xi, N/A
• Fits 2006 BMW 525i, N/A
• Fits 2006 BMW 525xi, N/A
• Fits 2001-2005 BMW 325i, N/A
• Fits 2001-2005 BMW 325xi, N/A
• Fits 2003-2005 BMW Z4, N/A

Common Replacement Reasons

• Battery warning light or charging-system fault
• Low system voltage at idle or under load
• Dim lights, weak electrical accessories, or intermittent charging
• Noise or bearing wear from the existing alternator
• Incorrect output from a failing BMW alternator

Installation Notes

Verify pulley groove count, rotation direction, amperage rating, and connector match before installation. Confirm the vehicle uses a serpentine belt system and compare the original unit to Valeo 439398 before removal. On BMW 325Ci, 330Ci, 330i, 330xi, 525i, 525xi, 325i, 325xi, and Z4 applications, proper belt routing and electrical connection checks are important after installation.

Quality Assurance

Valeo is an established OE supplier in electrical systems, and this alternator is built as a new replacement unit rather than a remanufactured assembly. That OE-focused construction supports consistent charging performance for select BMW applications.