Valeo 439649 Alternator

Valeo 439649 Alternator for Mercedes-Benz

The Valeo 439649 alternator is a 12-volt, 180-amp charging unit built for select Mercedes-Benz applications. As part of the Valeo OE line, it reflects the brand’s long history in electrical systems and original equipment alternator supply.

Designed with an internal fan, internal regulator, clockwise rotation, and a 6-groove serpentine pulley, this alternator is configured for direct-fit replacement on supported Mercedes-Benz models. The aluminium housing supports efficient packaging and durability in demanding charging-system service.

Key Features

• 12-volt alternator with 180-amp output
• Internal fan and internal regulator
• Clockwise rotation
• 6-groove pulley for serpentine belt systems
• Aluminium housing
• Valeo OE family construction
• Technical number: FGN18S016

Product Details

Valeo 439649 is an OE-style alternator engineered for Mercedes-Benz charging-system applications that require stable electrical output and correct pulley and rotation specifications. Valeo’s alternator program is known for original equipment supply, and this unit is 100% new, which helps avoid the risks associated with remanufactured components. The part number 439649 is also identified by technical number FGN18S016 for application matching.

This part cross-references BBB Industries 11455 and Remy 12977 for the same application.

Vehicle Fitment

• Fits 2009-2015 Mercedes-Benz G550, N/A
• Fits 2009-2012 Mercedes-Benz GL450, N/A
• Fits 2009-2012 Mercedes-Benz GL550, N/A
• Fits 2010-2011 Mercedes-Benz ML350, N/A
• Fits 2009-2011 Mercedes-Benz ML550, N/A
• Fits 2009-2011 Mercedes-Benz R350, N/A
• Fits 2009-2011 Mercedes-Benz SLK350, N/A
• Fits 2008 Mercedes-Benz GL450, N/A
• Fits 2008 Mercedes-Benz GL550, N/A
• Fits 2008 Mercedes-Benz ML550, N/A
• Fits 2008 Mercedes-Benz R350, N/A

Common Charging Issues This Can Address

• Low battery charging caused by alternator output loss
• Dim lights or electrical instability from weak charging voltage
• Battery warning light triggered by alternator failure
• Accessory performance problems related to insufficient system voltage
• Noise or charging inconsistency from a worn alternator assembly

Installation Notes and Tips

Verify the vehicle’s alternator specifications before installation, including 12-volt system voltage, 180-amp rating, clockwise rotation, 6-groove serpentine pulley, and technical number FGN18S016. Confirm the application against the vehicle’s build date where noted, especially 2008 Mercedes-Benz GL450, GL550, ML550, and R350 models with the 06/02/08 cutoff. Inspect the belt condition, pulley alignment, and charging connections during replacement to help ensure proper system operation.

Quality Assurance

Valeo has supplied original equipment electrical components since 1923 and is recognized for alternator innovation in the OE market. The Valeo 439649 alternator is a 100% new unit built to OE specifications for supported Mercedes-Benz applications.