The cranking circuit consists of the battery, starter motor, ignition switch, and related wiring. Only the starter motor will be covered here. For additional cranking system diagnosis refer to Starting and Charging Schematics .

The 3100 L82 uses the PG260 F1 starter motor. The 3800 L36 uses the PG260 F2 starter motor. These starter motors are not serviceable and should be replaced as assemblies only.

Notice: Never operate the starter motor for more than 30 seconds at a time. Allow it to cool for at least two minutes. Overheating, caused by too much cranking, will damage the starter motor.

When the ignition switch is turned to START, voltage is applied to the starter solenoid S terminal and the solenoid windings are energized. This causes the plunger to move the shift lever, which engages the pinion with the engine flywheel ring gear. The plunger also closes the solenoid contacts, applying battery voltage to the starter motor which cranks the engine.

When the engine starts, the pinion will over-run and spin at engine speed (rather than starter motor speed) to help prevent flywheel and starter motor damage. When the ignition switch is released (removing the voltage from the solenoid) the plunger return spring disengages the pinion. In order to prevent excessive over-run, the ignition switch should be released as soon as the engine starts.