When it comes to preventive maintenance and maintenance of various parts of the car, we seldom think that this also involves starter and alternator. It is generally believed that starter and alternator are electrical components with limited service life, and they are basically without many preventive maintenance requirements. When a car is assembled, the starting machine and the alternator start their service life together with other components. But after that, how long the actual life of these components is longer is difficult to predict accurately.