Starter Motor: Testing and Inspection

The following diagnosis and testing procedure is made after removal.

Fig. 6 Free Running Test:

1. Place starter motor in a vise equipped with soft jaws and connect a fully charged 12 volt battery to the starter motor.
2. Connect a test ammeter (100 ampere scale) and carbon pile rheostat, Fig. 6.
3. Connect a voltmeter (15 volt scale) across the starter motor.
4. Rotate the carbon pile rheostat to the Off position and connect a battery cable from battery negative post to starter motor body ground.
5. Adjust rheostat until the battery voltage shows a reading of 11 volts.
6. Ensure maximum amperage is within the specifications and starter motor turns smoothly.