Valeo 439770 Alternator

Valeo 439770 Alternator Overview

The Valeo 439770 alternator is a 12-volt charging system component built for Mercedes-Benz applications that require a 220 amp output. It features an internal fan, internal regulator, clockwise rotation, and a 7-groove serpentine pulley for OE-style fit and function. This Valeo OE alternator is a 100% new unit, which helps reduce the risk associated with remanufactured parts.

Key Features

• 12-volt alternator with 220 amp amperage rating
• Internal fan and internal voltage regulator
• Clockwise rotation direction
• 7-groove pulley for serpentine belt systems
• Aluminium housing for OE-style construction
• Valeo OE family part, engineered for original equipment applications
• Technical number: FGN23S048

Product Line Details

Valeo has supplied electrical systems since 1923 and is recognized as an original equipment alternator supplier. The Valeo Alternator line focuses on OE replacement fitment and charging performance, with designs that address voltage drop and support fuel economy improvements in the vehicle’s electrical system.

This Valeo 439770 alternator cross-references Remy 11115 for the same application.

Vehicle Fitment

• Fits 2012-2014 Mercedes-Benz ML350, N/A — VALEO IS THE OE SUPPLIER FOR THIS VEHICLE; 220 AMP; Alternator
• Fits 2013 Mercedes-Benz GL350, N/A — VALEO IS THE OE SUPPLIER FOR THIS VEHICLE; 220 AMP; Alternator

Common Replacement Reasons

• Charging system warning light or low-voltage condition
• Battery not maintaining charge during normal driving
• Dim lights or electrical accessories operating inconsistently
• Alternator noise, bearing wear, or charging output loss
• Need for a direct-fit Mercedes-Benz ML350 alternator or Mercedes-Benz GL350 alternator replacement

Installation Notes

Verify pulley groove count, rotation direction, amperage rating, and connector match before installation. Confirm the vehicle uses a serpentine belt drive and compare the original unit to part number 439770 or technical number FGN23S048 before replacement. After installation, check charging voltage and system operation to confirm proper output.

Quality Assurance

Valeo OE alternators are built as new units rather than remanufactured assemblies. That construction supports consistent charging performance and reduces the risk of premature failure associated with reused internal components.