Compatible for Nissan Patrol GU Y61 ZD30DDTi 2001-2015 Clutch Pulley LR190-752 AlternatorDescription In modern cars, alternators are used to charge batteries and power electrical systems while the engine is running. With the exception of certain hybrid vehicles, all vehicles with internal combustion engines are equipped with alternators. When the engine is running, the alternator charges the battery and provides additional power to the vehicle's electrical system. The alternator is bolted to the engine and is driven by a serpentine belt