Audi A5 8T Alternator HV Battery Earth Cable Terminal Wiring 2.0 TFSI 8K2971228F

The Audi A5 8T Alternator HV Battery Earth Cable Terminal Wiring 2.0 TFSI is a specialized earth wiring harness for the alternator and high-voltage battery, designed for petrol engines. It ensures a stable ground connection within the charging circuit, directly impacting the electrical system's operation and the power supply's safety. As an original Audi part, it guarantees a precise fit for the electrical architecture of the A5 8T model with the 2.0 TFSI engine.

Specifications and technical data

• SKU: RHD-8K2971228F-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K2971228F
• Substitutable numbers: 8K2971228F, 8K2 971 228 F, 8K0971824, 8K0 971 824
• Fuel type: Petrol
• Category: Other Starters, Alternators, ECUs & Wiring

Purpose and Function in the Electrical System

This alternator and high-voltage battery earth harness is designed for petrol powertrains, where reliable current discharge and minimized voltage drops are crucial. This component:

• connects the alternator's ground point to the vehicle's electrical system and the high-voltage battery,
• stabilizes the charging circuit under varying electrical loads,
• reduces the risk of connector overheating through appropriately selected cable diameter and terminal design,
• supports the correct operation of control units and consumers powered by the 12V system and related circuits.

Thanks to its factory-designed fit for the specific 2.0 TFSI petrol engine configuration, the harness maintains the correct cable routing geometry and terminal positioning relative to the alternator and battery.

Benefits of Using an Original Audi Harness

Using the original alternator and high-voltage battery earth cable in the Audi A5 8T offers several practical operational benefits:

• System Compatibility – the harness is prepared to work with the factory alternator and power supply system in petrol versions, requiring no modifications.
• Appropriate Electrical Characteristics – the cable cross-section, insulation type, and terminal design are selected for the current loads present in this model.
• Stable Charging System Operation – a proper ground connection minimizes voltage fluctuations, contributing to the longevity of the battery and electronic components.
• Hassle-Free Installation – factory lengths and cable shape facilitate routing through original mounting points, reducing the risk of chafing and mechanical damage.

Operational Characteristics and Installation

The offered item is a used part, meaning it is a pre-owned component retaining its original cable and terminal construction. In practice, this translates to:

• retention of factory connection points to the alternator and high-voltage battery,
• the possibility of installing it in place of a worn or damaged cable without altering the main wiring harness,
• reduced risk of installation errors typical for custom-made or universal cables.

Before installation, a standard inspection of the contact surfaces and proper tightening of screw connections are recommended to ensure low contact resistance and stable charging system operation.

Technical Support and Related Information

If you are planning a comprehensive repair or upgrade of the electrical system area in your Audi and require other components from the same group, such as earth cables, alternator harnesses, or battery terminals, check the available parts in the Other Audi category.

To better understand the design differences between sport versions and standard models of this brand, including the impact of the powertrain and engine accessories on the selection of electrical components, it is worth reading the article Audi RS vs Other Models – What Lies Under the Hood and Chassis?, which discusses, among other things, the specifics of powertrains and related components available in the Global Parts offer.