- A) The battery is faulty;
- b) The electrical connections between the switch, solenoid, battery and starter motor at any point do not transfer the required current from the battery through the starter to ground;
- V) The solenoid switch is faulty;
- G) The starter motor has a mechanical or electrical problem;
- d) The starter motor gear and/or transfer ring are severely worn and need to be replaced
2. To check the battery, turn on the headlights. If their light fades after a few seconds, the battery is low. If the headlights are bright, try turning on the ignition and see how the headlights behave. If they fade, it means power is reaching the starter motor, but is not driving it. If the starter cranks slowly, proceed to the next test.
3. If the headlights remain bright when the ignition is turned on, it means that insufficient current is supplied to the motor. Disconnect the battery wires, solenoid/starter power wires, and engine ground wires, clean them thoroughly, and then reconnect them. Lubricate the battery contacts with Vaseline to prevent corrosion. Corroded contacts are the most common cause of electrical system failures.
4. After you have completed all of the above checks and cleaning, but have not achieved positive results, you most likely hear a clicking sound every time you turn on the ignition. This is noise from the solenoid switch operating, but does not indicate that the main contacts were closing properly (If you don't hear any clicking sounds from the solenoid, it is definitely bad). The solenoid connection can be checked by connecting a voltmeter or light bulb between the main wire connection on the starter side of the solenoid and ground. When you turn on the ignition, there should be a certain reading on the voltmeter, or the light should light up. If the voltmeter shows nothing or the light does not light up, the solenoid is faulty and should be replaced.
5. If the starter motor runs but does not crank the engine, the starter gear and/or drive ring are likely very worn, in which case the starter motor will make an unusual noise when operating.
6. And finally, if it is determined that the solenoid is working and 12 volts are supplied to the starter, then the motor is faulty and should be removed for inspection.
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