BMW F20 F21 F30 F31 LCI Alternator Generator 14V 180A 8645329

BMW F20 F21 F30 F31 LCI Alternator Generator is an original charging system component from the Alternators and generators group, designed for use in compact and mid-size BMW F-series models after the facelift. It ensures a stable 14V power supply under high current loads, which is crucial for the proper operation of modern electrical and electronic systems in the vehicle. This is a solution for users who expect factory-fit quality and a proven design.

Specifications and technical data

• SKU: 8645329
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8645329
• Substitutable numbers: 8645329, 12318645329
• Part type: Alternator
• Category: Alternators & Generators

Purpose and compatibility with BMW models

The presented alternator has been designed for second-generation BMW F-series vehicles after the facelift (LCI), specifically for the F20, F21, F30, and F31 models. The design, intended for a 14-volt system and 180A load, allows for safe cooperation with the extensive onboard electronics typical of these BMW generations. Thanks to its BMW factory origin, the correct mounting points, geometry, and cable routing are maintained, which facilitates installation in place of a worn-out component.

Operating parameters and technical characteristics

The 14V 180A alternator provides a high current capacity margin, which is important when multiple consumers are operating simultaneously – from safety systems and comfort features to advanced multimedia. Stable charging voltage promotes proper battery operation, reducing the risk of premature wear. The design of the integrated AC generator with a rectifier and voltage regulation is adapted to the requirements of modern engine controllers and energy management systems in BMW vehicles.

Condition, origin, and benefits of choosing a used part

The offered item comes from the group of original BMW components and is sold as a used part. For many users, this represents a favorable compromise between purchase cost and maintaining factory build quality and fitment. Choosing an original alternator from the secondary market allows you to maintain the integrity of the charging system with other components, which is important for reliability and proper cooperation with the vehicle's electronics.

Practical installation and maintenance tips

When replacing an alternator in a BMW F-series, it is worth paying attention to the condition of the associated equipment – the drive belt, tensioner, and ground connections. Proper installation, while maintaining tightening torques and correct cable routing, minimizes the risk of subsequent charging problems. After installation, it is recommended to check the system's operating parameters using diagnostics to confirm voltage stability and proper communication with the vehicle's energy management system.

Expanding the charging system and related parts offer

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

Technical support and knowledge about BMW powertrains

For users interested in a broader context of component selection for modern BMW units, including elements working with extensive power supply and turbocharging systems, the Global Parts guide dedicated to the B58 unit and the 3 Series G20 may be helpful. Practical checklists, tips on compatibility, and the importance of OEM numbers can be found in the article BMW B58 code, or 340 HP from the secondary market – a checklist before buying a turbocharger and intercooler for the BMW 3 Series (G20).