BMW E46 Alternator Generator Diesel Engine M47N M57N 150A Lucas LRA02891

Visual condition of the part

The product shows signs of use visible in the photos.

BMW E46 Alternator Generator Diesel Engine M47N M57N 150A Lucas is an original component from the Alternators and generators group, designed for BMW diesel engines. Thanks to its high current efficiency and design tailored to diesel units, it ensures a stable power supply for the electrical system and proper battery charging under demanding operating conditions.

Specifications and technical data

• SKU: 7789980-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7789980
• Substitutable numbers: 12317789980, 7789980, 12317797660, 7797660, 12317788248, 17788248, LRA02891, BG
• Fuel type: Diesel
• Category: Alternators & Generators

Purpose and technical characteristics

The presented alternator is designed to work with BMW M47N and M57N diesel engines, which means it is matched to the specific electrical loads and operating characteristics of diesel units. The 150A output allows for a stable power supply to factory electrical equipment and additional consumers, such as advanced audio systems or parking heaters.

The Lucas alternator from this series belongs to the OEM solutions used in BMW, which translates into correct charging parameters, compatibility with factory control systems, and appropriate operating characteristics at both low and high RPMs. This is particularly important in diesel engines, where starting and idling generate high demand for electrical energy.

Benefits of using a 150A alternator in a BMW diesel

Using a 150A alternator in a BMW with a diesel engine provides a number of practical benefits:

• stable battery charging with a large number of electrical consumers,
• adequate power reserve for the onboard electrical system,
• proper cooperation with the diesel engine's control electronics,
• maintenance of operating parameters in accordance with BMW factory specifications.

As a result, this alternator is a good choice both for standard operation and in vehicles equipped with additional power consumers. Proper matching to the diesel engine reduces the risk of voltage drops, starting problems, or errors in electronic systems.

Condition, origin, and fitment

The offered alternator is a used part, sourced from a dismantled BMW vehicle. This type of part allows for an economical repair of the charging system while maintaining the manufacturer's original specifications. In practice, this means correct mounting points, the appropriate type of electrical connectors, and compatibility with factory engine accessories.

An additional advantage is the presence of dedicated replacement numbers, which facilitates verification of compatibility with a specific engine version and vehicle model year. Before purchasing, it is worth comparing the alternator markings with the vehicle data to ensure that the component will fit plug&play into the existing installation.

Application in service practice

The alternator from this series will work well both for a typical replacement of a worn-out component and for comprehensive maintenance of the charging system in a BMW with a diesel engine. It can be used in:

• charging system repairs following an alternator failure,
• servicing the electrical system related to voltage problems,
• restoring the factory configuration after previous non-original modifications.

By maintaining OEM parameters, the Lucas alternator allows for consistency with BMW's factory service documentation, which facilitates diagnostics and further vehicle maintenance.

Expanding the BMW charging system

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other components from the same group, such as pulleys, tensioners, or additional power cables, check out the available parts in the BMW Alternators and generators category.

For drivers interested in a broader perspective on selecting used components for turbocharged units and the impact of accessories on driving characteristics, an article comparing turbochargers in sports versions of Mini may be helpful – you can find it here: Go-Kart Feeling XXL – used N18 turbocharger versus B48 in Mini Cooper S.