Valeo 439738 Alternator

OE-Quality Charging Performance

Valeo alternator part number 439738 is a 12-volt charging component built for Mercedes-Benz applications that require a direct-fit electrical replacement. It features an internal regulator, internal fan, and a solid pulley setup for dependable belt-driven operation.

As part of the Valeo OE line, this alternator reflects the brand’s long history in automotive electrical systems and its focus on new, never-remanufactured units. The 180-amp output, aluminum housing, and six-groove serpentine pulley support stable charging performance in demanding daily use.

• 12-volt alternator with 180-amp output
• Internal regulator and internal fan design
• Solid pulley with six grooves for serpentine belt systems
• Aluminum housing for a lightweight, durable construction
• Female connector with two terminals

Fitment Details

Compatible with Mercedes-Benz GLE350, 2016-2018; E350, 2012-2016; C350, 2012-2015; ML350, 2013-2015; SLK350, 2012-2014; E400, 2013; and R350, 2012-2013. Fits 2016-2018 Mercedes-Benz GLE350, N/A. Fits 2012-2016 Mercedes-Benz E350, N/A. Fits 2012-2015 Mercedes-Benz C350, N/A. Fits 2013-2015 Mercedes-Benz ML350, N/A. Fits 2012-2014 Mercedes-Benz SLK350, N/A. Fits 2013 Mercedes-Benz E400, N/A. Fits 2012-2013 Mercedes-Benz R350, N/A.

Common Replacement Uses

• Charging system warning lights caused by alternator output loss
• Battery drain from insufficient charging voltage
• Noise or belt-drive issues related to a worn pulley assembly
• Electrical instability from a failing internal regulator
• Reduced charging performance under accessory load

Installation Notes

Verify pulley groove count, connector style, rotation direction, and amperage rating before installation. Confirm the vehicle’s serpentine belt configuration and electrical connection match the specifications of part number 439738. Professional installation and system testing after replacement are recommended.

Quality Assurance

Valeo has supplied OE electrical components since 1923, and this alternator is engineered as a new OE-quality unit rather than a remanufactured part. Part number 439738 also cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.