Valeo 439537 Alternator

Valeo 439537 Alternator Overview

The Valeo 439537 alternator is a 12-volt, 180-amp charging unit built for BMW applications that require stable electrical output and OE-style fitment. It uses an internal fan, internal regulator, clockwise rotation, and a 6-groove pulley for direct replacement service.

As part of the Valeo OE family, this alternator reflects Valeo’s long history in electrical systems and original equipment supply. Valeo premium alternators are supplied as 100% new units, which helps reduce the risk associated with remanufactured components.

Key Features

• 12-volt alternator with 180-amp output
• Internal fan and internal voltage regulator
• Clockwise rotation
• 6-groove pulley design
• Aluminium housing for OE-style construction
• Technical number TG17C027B

Detailed Description

This Valeo alternator 439537 is built for charging-system replacement on select BMW 545i, 550i, 645Ci, 650i, 745i, 745Li, 750i, 750Li, and X5 models. It is an OE-supplier style replacement for BMW charging systems that need consistent voltage delivery and the correct pulley and rotation configuration. This part cross-references Bosch (e.g., 15726, AL9357X) for the same application.

Use this alternator when servicing a BMW 650i alternator replacement, a BMW X5 alternator replacement, or a BMW 745Li charging system repair where the original unit matches the listed electrical and mounting specifications. The Valeo 439537 part number is also identified by technical number TG17C027B.

Vehicle Fitment

• Fits 2006-2010 BMW 650i, N/A
• Fits 2006-2009 BMW 550i, N/A
• Fits 2006-2008 BMW 750i, N/A
• Fits 2006-2008 BMW 750Li, N/A
• Fits 2006 BMW 545i, N/A
• Fits 2004-2006 BMW X5, N/A
• Fits 2004-2005 BMW 545i, N/A
• Fits 2004-2005 BMW 645Ci, N/A
• Fits 2005 BMW 745i, N/A
• Fits 2002-2003 BMW 745i, N/A
• Fits 2004-2005 BMW 745Li, N/A
• Fits 2004 BMW 745i, N/A
• Fits 2002-2003 BMW 745Li, N/A

Installation Notes and Tips

Confirm the original alternator matches 12 volts, 180 amps, clockwise rotation, internal regulation, and the 6-groove pulley before installation. Verify connector style, belt alignment, and mounting points against the removed unit to ensure proper fit on BMW 545i, 550i, 645Ci, 650i, 745i, 745Li, 750i, 750Li, and X5 applications.

Inspect the battery, drive belt, and charging cables during replacement. A weak battery or worn belt can affect charging performance and shorten alternator service life.

Quality Assurance

Valeo is a recognized OE supplier in electrical systems, and this alternator is supplied as a 100% new unit rather than a remanufactured part. That construction supports consistent charging performance for BMW applications that require OE-level specifications.