Disconnect the field coil wire from the M-terminal of the solenoid.
Connect a 12V battery the S-terminal and the M-terminal.
The pinion will move out.
This test must be performed quickly (in less than 10 seconds) to prevent the coil from burning.
Check the pinion for stopper clearance (pinion gap) with a feeler gauge.
If the pinion gap is out of specification, adjust by adding or removing gaskets between the solenoid and the front bracket.
Disconnect the field coil wire from the M-terminal of the magnetic switch.
Connect a 12V battery between the S-terminal and the M- terminal.
This test must be performed quickly (in less than 10 seconds) to prevent the coil from burning.
If the pinion moves out, then the pull-in coil is good. If it doesn't move out, replace the magnetic switch.
Disconnect the field coil wire from the M-terminal of the magnetic switch.
Connect a 12V battery between the S-terminal and the body.
This test must be performed quickly (in less than 10 seconds) to prevent the coil from burning.
If the pinion moves out, everything is in order. If the pinion moves back and forth repeatedly, the hold-in circuit is open. Then replace the magneticswitch.
Place the starter motor in a vise equipped with soft jaws and connect a fully-charged 12-volt battery to starter motor as follows:
Connect a test ammeter (100-ampere scale) and carbon pile rheostat as shown is the illustration.
Connect a voltmeter (15-volt scale) across starter motor.
Rotate carbon pile to the off position.
Connect the battery cable from battery's negative post to the starter motor body.
Adjust until battery voltage shown on the voltmeter reads 11 volts.
Confirm that the maximum amperage is within the specifications and that the starter motor turns smoothly and freely:
Disconnect field coil wire from the M-terminal of the magnetic switch.
Connect a 12V battery between M-terminal and the body.
This test must be performed quickly (in less than 10 seconds) to prevent the coil from burning.
Pull pinion out and release. If pinion returns quickly to its original position, everything is in order. If it doesn't, replace the magnetic switch.