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A pre-engaged starter motor- Note the leadconnections Solenoid Activating lever Shaft Pinion Field coil Armature Commutator Brushes

A pre-engaged type of starter motor incorporates a solenoid. When the started switch is turned on, the solenoid activates a lever which first moves the pinion along the shaft to engage with the flywheel ring gear and only then operates the switch that starts the motor turning.

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Checking and replacing the starter motor

Testing for short circuits Use a test lamp fitted with crocodile clips to make these tests. You ...