Valeo 439640 Alternator

Valeo 439640 Alternator for BMW Charging Systems

The Valeo 439640 is a 12-volt alternator built for BMW charging system applications that require a 230 amp output, internal regulation, and clockwise rotation. It is a Valeo OE family unit with an internal fan and an aluminum housing for a direct-fit electrical replacement.

Valeo has supplied original equipment alternators since 1923, and this premium alternator is 100% new. That matters for BMW 740i, BMW 740Li, and BMW X6 owners looking for a replacement that matches the vehicle’s charging requirements without reusing worn internal components.

Key Features

• Part number: 439640
• 12-volt alternator with 230 amp amperage rating
• Internal regulator and internal fan design
• Clockwise rotation
• 8-groove pulley for serpentine belt systems
• Aluminum housing
• Valeo OE family construction
• Technical number: TG23C033

Product Line Details

This alternator comes from Valeo’s OE-focused alternator line, built around original equipment specifications for charging performance and fit. Valeo’s engineering background in electrical systems and its OE supplier role support consistent output for modern BMW electrical loads.

Detailed Description

The Valeo 439640 alternator is engineered for vehicles that depend on stable charging voltage and high electrical output. With a 230 amp rating, it supports the demands of BMW systems that use multiple electrical accessories and control modules. The internal regulator helps manage charging output within the alternator assembly, while the 8-groove serpentine pulley and clockwise rotation match the listed applications. This part cross-references BBB Industries 11394 for the same application.

Compatible With BMW 740i, BMW 740Li, and BMW X6 applications listed below, this alternator is a direct replacement choice for drivers addressing charging-system faults on these platforms. The 439640 part number is also referenced by interchange numbers including 12944 and 478144.

What It Helps Solve

• Battery warning light caused by low alternator output
• Charging voltage drop during electrical load demand
• Weak battery charging after driving
• Dim lights or unstable electrical performance
• Alternator failure on high-demand BMW charging systems

Installation Notes and Tips

• Verify pulley groove count, rotation direction, and amperage rating before installation.
• Confirm the vehicle uses a serpentine belt drive with an 8-groove pulley.
• Inspect the battery, belt condition, and charging cables when replacing the alternator.
• Check the vehicle’s charging system after installation to confirm proper output.

Quality Assurance

Valeo is a long-standing OE supplier in electrical systems, and this alternator is supplied as a 100% new unit rather than a remanufactured part. That construction supports consistent performance for BMW charging system replacement needs.

Compatible Vehicles

• Fits 2011-2015 BMW 740i, N/A
• Fits 2011-2015 BMW 740Li, N/A
• Fits 2008-2010 BMW X6, N/A