The Genuine BMW Alternator - 12317606628 is a high-quality, original equipment manufacturer (OEM) part designed specifically for BMW vehicles. It is responsible for converting mechanical energy from the engine into electrical energy to power the vehicle's electrical system and charge the battery. This alternator is built to the highest standards of quality and reliability, ensuring optimal performance and durability. It is a direct replacement for the original alternator in BMW models and is backed by a manufacturer's warranty.