Free Running Test
- Place the starter motor in a vise equipped with soft jaws and connect a fully-charged 12-volt battery to the starter motor as follows:
- Connect a test ammeter (100-ampere scale) and carbon pile rheostat in series between the positive battery terminal and starter motor terminal.
- Connect a voltmeter (15-volt scale) across the starter motor. See Fig 1 and Fig 2.
- Rotate carbon pile to full-resistance position.
- Connect the battery cable from the negative battery terminal to the starter motor body.
- Adjust the rheostat until the battery positive voltage shown by the voltmeter is 11 V.
- Confirm that the maximum amperage is within the specifications and that the starter motor turns smoothly and freely.
Current: maximum 90 Amps