Alternator Generator BMW E87 E90 E91 Diesel Engine Electrical Unit 150A 7802471

Visual condition of the part

The product shows signs of use visible in the photos.

Alternator Generator BMW E87 E90 E91 Diesel Engine Electrical Unit 150A is an original component from the Alternators and generators group, designed for BMW powertrains with diesel engines. It ensures stable charging of the electrical system, which translates into reliable starting, correct operation of control units, and comfortable use of the vehicle's electrical equipment.

Specifications and technical data

• SKU: 7802471-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7802471
• Substitutable numbers: 12317802471, 7802471, BG, 12317802927, 7802927
• Fuel type: Diesel
• Category: Alternators & Generators

Purpose and function in the electrical system

The alternator in BMW cars with a Diesel engine is responsible for converting mechanical energy from the crankshaft into electrical energy, powering the battery and all electrical consumers. In the 150A capacity version, it is adapted to the load typical for modern power units equipped with extensive electronics, comfort systems, and safety features.

Using an alternator matched to a specific BMW series allows for maintaining the correct voltage in the system, reducing the risk of headlight power drops, control unit errors, and starting problems in low temperatures. It is a key component for the stable operation of the entire electrical system.

Benefits of using an original BMW alternator

Choosing an alternator from the BMW OE group means maintaining factory operating parameters and fitment for a specific diesel engine configuration. The original generator is designed with the following in mind:

• appropriate charging characteristics for diesel units,
• compatibility with factory engine control and energy management systems,
• correct installation in the engine bay without the need for modifications to mounts or wiring.

As a result, the alternator operates within the load range specified by the manufacturer, which promotes the durability of the battery, starter, and other electrical system components. This is a particularly beneficial solution for cars used intensively or in varying road conditions.

Performance characteristics and operation

The 150A capacity alternator is suitable for vehicles with a larger number of electrical consumers – heated windows, extensive audio systems, power steering systems, or additional comfort modules. This provides a power reserve when idling and while driving with multiple systems switched on simultaneously.

As a used item, the alternator comes from disassembly and is intended for users looking for an economical yet structurally compliant solution for their BMW. This type of part allows for restoring the efficiency of the charging system without the need to invest in a new component, while maintaining the original installation specification.

Fitment, identification, and reference numbers

Precise matching of the alternator to a specific BMW model is facilitated by manufacturer markings, including the OEM part number and associated interchangeable numbers. Thanks to these, you can verify compatibility with your power unit and avoid problems with installation or charging system operation. If necessary, it is worth comparing the markings on the old generator with the data in the product's technical specification.

The presence of reference numbers is particularly important when selecting an alternator for specific body and engine versions of the BMW E87, E90, and E91 series, where there are differences in engine accessories, mounts, and electrical system configurations.

Expansion of the charging system and related components

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 additional generators, auxiliary generators, or alternators with similar capacity, check the available parts in the BMW alternators and generators category.

In the case of more extensive work on diesel engine accessories – including, for example, the timing system, fuel injection, or control elements – specialist guide materials may also be helpful. Example tips regarding the maintenance of engine accessories in popular C and E-class models can be found in the article Reliability under the star sign – how to take care of engine accessories in popular Mercedes-Benz C and E-class models?, which discusses a practical approach to operation and service prevention.