Genuine OEM Volkswagen Battery Earth Line, part number 2Q0971537AB. This critical cable establishes the negative electrical connection from the vehicle's battery to the chassis, completing the electrical circuit for all components. It connects directly from the battery terminal to a designated grounding point on the vehicle body. The cable measures approximately 40.5 cm in length and weighs 0.16 kg. Using a genuine OEM earth line ensures correct gauge, insulation, and terminal quality, preventing electrical resistance issues, corrosion, and maintaining overall system reliability.