Before troubleshooting the starting motor, make sure the battery terminals are not loose or corroded.
Starting M otor Solenoid
If the starting motor solenoid does not make an audible sound, check for loose wiring connections.
Use a Digital Multimeter such as Part No. 3377161 to set the voltage scale.
Check for system voltage at the starting motor solenoid battery terminal.
If the multimeter indicates system voltage at the starting motor battery terminal, check the voltage at the starting
motor solenoid “ S” terminal, which the starting switch is energized.
If the multimeter indicates system voltage at “ S ” terminal, but the starter does not engage, the starting motor
solenoid is malfunctioning and the starter must be replaced.
If the multimeter does not indicate system voltage at the “ S ” terminal, check:
• Fuses
• Voltage to the ignition switch and magnetic switch.
Refer to “Starting Motor Switch and Magnetic Switch
– Checking’’ in this section.
• Application safety shutoff systems.
Starting Motor
Check for system voltage at the “ M ” terminal of the starting motor, while the starter switch is energized.
• System Voltage: Starting motor is malfunctioning or not adequately grounded and must be repaired or replaced.
• No Voltage: Starting Motor solenoid is malfunctioning and must be replaced.
If the starting motor solenoid makes an audible sound, turn the switch off and attempt to bar the crankshaft in
both directions.
Bar the crankshaft as follows:
1. Direction of engine rotation.
2. Direction opposite engine rotation.
3. Direction of engine rotation.
If the crankshaft will bar at step No. 3, attempt to start the engine. If the starting motor cranks the engine, check the
starting motor pinion g e a r and flywheel ring gear for damage.
