Mercedes W164 W204 W211 OM642 Diesel Alternator Generator Lucas A6421540402

Mercedes W164 W204 W211 OM642 Diesel Alternator Generator Lucas is an original charging system component designed for OM642 diesel engines, mounted at the front of the power unit. Thanks to its factory design, it ensures stable power supply for the electrical system and proper battery charging under the demanding operating conditions of a diesel engine. This used component from this series is a sensible choice for professional repairs or alternator replacement in mid-range and premium Mercedes vehicles.

Specifications and technical data

• SKU: A6421540402-3
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6421540402
• Substitutable numbers: A6421540402, A 642 154 04 02
• Location on the vehicle: Front
• Fuel type: Diesel
• Category: Alternators & Generators

Application and compatibility

The presented alternator is intended for Mercedes vehicles from the W164, W204, and W211 families equipped with the OM642 diesel engine. The design, adapted for diesel units, ensures adequate current efficiency under high electrical loads typical for modern comfort and safety systems.

Its location at the front of the powertrain facilitates service access and integration with engine accessories, which translates into more efficient handling during inspections and repairs.

Technical and functional characteristics

The alternator belongs to the Alternators and generators group, responsible for generating electrical energy in the vehicle. It is designed to work with a 12 V system in passenger cars, providing stable voltage for control units, safety systems, lighting, and comfort equipment.

The design accounts for operation within typical diesel RPM and load ranges, allowing for effective battery charging during both city driving and highway conditions. Proper cooling and mounting in the front engine zone help maintain operating parameters over a long service life.

Benefits of using an original alternator

• Factory fitment for the OM642 unit and accessory layout in W164, W204, and W211 models, which minimizes the risk of installation issues.
• Operating parameters tailored to the requirements of the diesel engine, ensuring stable charging at variable RPMs.
• Consistency with the vehicle's factory electrical system, with no need for wiring or mounting modifications.
• A cost-effective choice for charging system repairs in premium class cars.

Condition and service purpose

The offered alternator is a used component, intended for professional replacement in Mercedes vehicles with the OM642 engine. This type of component is suitable both for typical charging system repairs and for comprehensive service of the front engine area when multiple accessory components need to be replaced simultaneously.

Expanding the Mercedes charging system

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other elements from the same group, such as additional generators, alternators with similar specifications, or compatible charging system components, check out the available parts in the Mercedes Alternators and generators category.

Service and tuning knowledge and inspiration

If you are considering improving the ergonomics and aesthetics of the cabin in parallel with work on the powertrain, it is worth checking out tips on interior modifications using proven aftermarket elements – you will find practical advice in the article Car interior tuning with Global Parts.