Valeo 439842 Alternator

Valeo 439842 Alternator for Mercedes-Benz

The Valeo 439842 alternator is a 12-volt, 200-amp charging unit built for Mercedes-Benz applications that require OE-level electrical performance. As part of the Valeo OE alternator line, it uses an internal fan, clockwise rotation, a 6-groove pulley, and an aluminum housing for a direct-fit replacement focused on stable charging output.

Key Features

• 12-volt alternator with a 200-amp amperage rating
• Internal fan design for integrated cooling
• Clockwise rotation direction
• 6-groove pulley configuration
• Aluminum housing construction
• Valeo OE family replacement built as a 100% new unit
• Technical number: CG20U011

Product Details

Valeo has supplied original equipment electrical components since 1923, and this alternator reflects that OE-focused engineering. The 439842 is built for Mercedes-Benz charging systems that call for a 200-amp alternator, including E450, SL450, GLE400, E400, CLS400, SL400, C400, and ML400 applications. If you are searching for a Mercedes-Benz E450 alternator, Mercedes-Benz SL450 alternator, or a Valeo 439842 replacement alternator, this unit matches the listed OE-style application requirements.

This part cross-references Anchor 10326 and Quality-Built 11248 for the same application.

What It Helps Address

• Battery warning lights caused by weak charging output
• Low system voltage during electrical load demand
• Dim lights or inconsistent accessory performance
• Charging system failure from a worn or unstable alternator
• Starting issues related to insufficient battery replenishment

Installation Notes and Tips

Verify pulley groove count, rotation direction, amperage rating, and connector fit before installation. Confirm the vehicle uses the listed 12-volt, 200-amp configuration and match the OE reference numbers when comparing the Valeo 439842 to the original unit. For Mercedes-Benz E400, CLS400, SL400, C400, and ML400 charging system service, inspect the belt condition and charging circuit connections during replacement.

Quality Assurance

Valeo is a recognized OE supplier in electrical systems, and this alternator is a 100% new replacement rather than a remanufactured unit. That construction helps reduce the risk associated with premature failure and supports consistent charging performance in the listed Mercedes-Benz applications.