Main Battery Cable Harness / Battery Power Cable – 4K0971227A

Original factory battery power electrical harness (main positive cable / power distribution and battery terminal installation), designed for Audi A7 Sportback, S7 and RS7 (4K / 4K8 generation) and Audi A6 C8 (type 4K2 / 4K5 / 4KA) produced from model year 2018 to 2026, including versions with 3.0 V6 TFSI (55 TFSI / 340 hp), 2.0 TFSI (40/45 TFSI), S7 and RS7 variants, and TDI diesel engines with Mild Hybrid (MHEV 12V / 48V) systems, based on the modular longitudinal MLBevo platform.

Original VAG high-current electrical system component. Made of thick, flexible copper cable with a large cross-section, in heat-shrink sleeve and ribbed protective conduit resistant to abrasion, moisture, and high temperatures. The harness connects the starter battery terminal in the trunk with the main high-current fuse box, pyrotechnic distribution unit, and power supply points of the onboard installation. It is responsible for lossless flow of starting current, proper battery charging, and stable power supply of advanced onboard controllers in the MLBevo digital network.

Technical specifications:

• Catalog part number (OE): 4K0971227A / 4K0 971 227 A (interchangeable with revisions of the 4K0971227, 4K0971227B, 4K0971227C, 4K0971227D series)

• System / Category: Electrical installation and accessories / Battery harnesses, positive power cables and starter cables (Battery Wiring Harness Cable / Leitungssatz für Batterie Pluspol)

• Function: Main power cable for supplying the installation from the battery

• Installation compatibility: 12V and Mild Hybrid systems (MHEV with 48V / 12V installation)

• Engine version: Gasoline engines (TFSI) – including 3.0 V6 TFSI (55 TFSI), 2.0 TFSI, 2.9/4.0 TFSI and TDI engines

• Connectors: Original factory copper ring terminals, VAG connector sockets and high-current terminals

• Mounting location: Trunk / spare wheel floor compartment – 12V battery and power distribution area

• Dedicated model: Audi A7 Sportback / S7 / RS7 (type 4K8) and Audi A6 / Avant / Allroad (type 4K / C8)

• Steering side: Left (LHD) and Right (RHD) – universal element

• Condition: Original part, used (100% functional – fully conductive, no insulation damage, no burn marks, dents, abrasions or oxidized copper, factory conduits and plugs intact)

• Manufacturer: Audi AG / VAG / Kromberg & Schubert / Leoni (OEM Original)

Main application:

• Audi:

  • A7 Sportback (type 4K8) – model years from 2018 to 2026 (all TFSI, TDI, MHEV engine versions)

  • S7 Sportback (type 4K8) – model years from 2019 to 2026

  • RS7 Sportback (type 4K8) – model years from 2019 to 2026

  • A6 / A6 Avant / Allroad (type 4K2 / 4K5 / 4KA - C8) – model years from 2018 to 2026

  • S6 / RS6 Avant (type 4K - C8) – model years from 2019 to 2026

Fitment guarantee and VIN verification

Each harness undergoes a wire continuity test to check for internal resistance, a check of the ring terminal condition, and an inspection of the protective conduit flexibility before shipping.

Fitment / installation tip: The initial designation 4K0 (electrical installation group 971) with index A specifies the high-current harness configuration adapted to the power distribution architecture in the rear of the body of the new A7/A6 4K platform. Insulation damage, corroded connectors, or compromised battery cable connections cause voltage drops during starting, CAN bus errors in the controllers, MMI settings resets, and electrical power system fault messages. Installing the original OEM harness with factory-crimped terminals eliminates the risk of overheating connections and short circuits in the high-current installation. Before purchase, we recommend comparing the OE number on the harness conduit label or verifying it using the vehicle's VIN.