Genuine OEM Audi Alternator Voltage Regulator, part number 06J903803A. This crucial electrical component is responsible for precisely regulating the voltage output from the alternator, ensuring a stable and consistent electrical supply to the vehicle's systems and battery charging. It is typically mounted directly to the alternator. Weighing 0.1 kg and measuring 0.09m in length, this regulator is engineered for accurate electrical performance. Using a genuine OEM voltage regulator guarantees correct calibration, stable voltage output, and long-term reliability for the entire electrical system.