Genuine OEM Audi Voltage Regulator, part number 079903803G. This component is responsible for regulating the output voltage of the alternator, ensuring that the vehicle's electrical system receives a stable and correct voltage. It is typically integrated with or attached to the alternator. Manufactured to precise electrical specifications for reliable operation. Genuine OEM voltage regulators are calibrated to prevent overcharging or undercharging of the battery and protect sensitive electronics.