Alternator Generator Mercedes W169 W245 OM640 Diesel Engine 150A 14V A6401540402

Alternator Generator Mercedes W169 W245 OM640 Diesel Engine 150A 14V is a component from the Alternators and generators group, designed for Mercedes diesel engines from the OM640 family in A-Class and B-Class models. This used component ensures a factory-fit for the vehicle's electrical system, which facilitates installation and helps maintain proper battery charging parameters in Diesel-powered cars.

Specifications and technical data

• SKU: A6401540402
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6401540402
• Substitutable numbers: A6401540402, A 640 154 04 02
• Fuel type: Diesel
• Category: Alternators & Generators

Purpose and compatibility

The presented alternator is structurally matched to the OM640 power units used in Mercedes A-Class (W169) and B-Class (W245) diesel models. Using an original solution from the same family of components allows for proper integration with the factory engine control system, charging installation, and starting system.

By maintaining the correct operating characteristics of the alternator, the vehicle's electrical system maintains a stable supply voltage, which is important for battery longevity, the proper operation of control units, lighting, and comfort equipment.

Performance parameters and role in the electrical system

The alternator in the OM640 diesel engine is responsible for continuously charging the battery and powering all electrical consumers while the engine is running. A properly selected component:

• ensures stable battery charging at various engine speeds,
• maintains the appropriate voltage for control units and sensors,
• reduces the risk of voltage drops under high system load,
• supports reliable starting of the diesel engine in various operating conditions.

Using an alternator from the same design group as the factory-installed one minimizes the risk of improper charging system operation and eliminates the need for system modifications.

Characteristics of the used product

The offered alternator is a used item, which in practice means a favorable compromise between purchase cost and maintaining the manufacturer's original specifications. Choosing such a solution is particularly attractive for maintenance repairs in older Mercedes A-Class and B-Class vehicles, where it is crucial to maintain the efficiency of the electrical system at reasonable service costs.

A used component from the Alternators and generators group allows for the retention of the factory mounting method, proper cable routing, and correct interaction with the accessory belt, which facilitates installation in workshop conditions.

Benefits of using the alternator in a Mercedes Diesel

In OM640 diesel engines, a functional alternator has a direct impact on driving comfort and safety. A properly operating component:

• stabilizes the electrical system operation under high load (lighting, heating, onboard electronics),
• reduces the risk of battery discharge during city driving,
• supports the reliability of safety systems dependent on electrical power,
• allows for maintaining operating parameters in accordance with Mercedes manufacturer specifications.

For users who want to keep their car in good technical condition without excessive costs, choosing an original, used alternator is a practical and functional solution.

Charging system expansion and additional information

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 characteristics, or compatible accessory components, check the available parts in the Mercedes alternators and generators category.

If you are considering a broader replacement of components in your Mercedes and want to better understand the advantages of using original parts from dismantling, it is worth reading the article Used parts for Mercedes – original parts from dismantling, which discusses the practical aspects of selecting and operating such components.