The alternator idler pulley is an important component in a car's alternator belt system. Its main function is to maintain proper belt tension and prevent vibration or slipping. This part is a pulley or roller mounted on a bearing, and as it rotates, it ensures that the alternator belt moves along its correct path, guaranteeing optimal performance of the alternator and other components driven by the belt, such as the power steering pump and air conditioning compressor.
