Genuine OEM Audi Voltage Regulator, part number 077903803C. This component is essential for maintaining a stable electrical voltage output from the alternator, protecting the vehicle's sensitive electronic systems from voltage fluctuations. It typically integrates with the alternator assembly. Weighing 0.113 kg, this regulator ensures consistent power delivery. Choosing a genuine OEM voltage regulator guarantees precise voltage control and long-term reliability for the charging system.