The starter often can not rotate or rotate slowly failure and phenomenon, in this case, should be examined in the following aspects:
1, the battery has no electricity or weak power, so the starter can not rotate or rotate slowly failure.
2, starter thread loose or off, switch or adsorption switch failure.
3, brush wear or brush surface, spring is weak, so that the rectifier contact bad.
4. Short circuit and open circuit of excitation coil or armature coil.
5, the rectifier fouling, mica chip protruding, resulting in electrical brush and rectifier contact bad.