BMW E84 E90 E91 LCI 320xd N47 Cable Alternator Starter Base B

BMW E84 E90 LCI N47 Alternator Starter Cable is an original BMW electrical system component, designed to connect the alternator to the starter in N47 units. The precise design of the cable ensures stable power for starting and charging, which translates to reliable operation of the electrical system in daily use.

Specifications and technical data

• SKU: 7823731
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7823731
• Substitutable numbers: 12427823731, 7823731, 12427808495, 7808495, EM
• Category: Wiring Harnesses, Cables & Connectors

Cable Purpose and Function

The presented cable is a part of the Cables, Harnesses, and Connectors group, responsible for transmitting current between the alternator and the starter in the N47 engine used in BMW E84 and E90 LCI series. A correctly selected cable in this area is crucial for:

• stable engine start,
• proper battery charging,
• maintaining appropriate voltage drops in the system,
• reducing the risk of electrical connection overheating.

Thanks to the use of an original BMW solution, the correct conductivity characteristics and compatibility with factory mounting points are maintained.

Benefits of Using an Original BMW Cable

Using an alternator-starter cable from BMW's offering allows for maintaining the electrical system's consistency with the vehicle's original technical documentation. The most important advantages include:

• Factory Fitment – the cable's length, cross-section, and ends are designed for specific engine and body configurations, facilitating installation.
• Compatibility with Original Connectors – the cable works with factory alternator and starter terminals, minimizing the need for modifications.
• Consistency with BMW Service Documentation – simplifies diagnostics and subsequent service work in authorized and independent workshops.
• Safe Operation of the Starting System – a correctly selected cable minimizes the risk of voltage drops and localized overheating.

Product Characteristics and Condition

The offered alternator-starter cable comes from the BMW line and is an original part intended for reinstallation in vehicles with the appropriate engine and body configuration. The product is in used condition, meaning it has been previously operated in a vehicle but retains the functionality required for further use after proper installation.

To ensure the reliability of the electrical system, installation in a vehicle with a matching specification is recommended, taking into account proper cable routing, protection against abrasion, and correct tightening of all screw connections.

Selection by Part Numbers and System Integration

The component has a dedicated OEM part number and associated replacement numbers, which facilitates unambiguous identification in BMW catalogs and parts selection systems. This allows for precise verification of the cable's compatibility with a specific N47 engine version and E84 or E90 LCI body, minimizing the risk of installing an incorrect component.

Proper selection of the alternator-starter cable is particularly important in vehicles equipped with extensive onboard electronics, where voltage stability affects the operation of control units, safety systems, and driving comfort.

System Expansion and Additional Information

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other parts from the same group, such as power cables, sensor harnesses, or ground connectors, check the available parts in the BMW Cables, Harnesses, and Connectors category.

If you want to better understand how the use of original used components affects the durability and precision of Bavarian-engineered vehicles, it is worth reading the article BMW – Sporty Performance and Precision. How Original Used Parts Extend the Life of the Bavarian Icon?, which discusses the practical aspects of selecting parts by OEM numbers and service procedures.