The alternator idler pulley is an important component in the vehicle’s alternator belt system. Its primary function is to maintain proper belt tension and prevent vibration or slipping. This component is designed as a pulley or roller mounted on a bearing, and through its rotation, it ensures that the alternator belt follows the correct path.
Proper operation of the idler pulley helps guarantee optimal performance of the alternator and other belt-driven components, such as the power steering pump and the air conditioning compressor.