can a bad solenoid drain your battery

Can a bad solenoid drain your battery

The solenoid is a small device inside the starter motor. When you switch on the lawn mower ignition switch the battery sent a small electrical signal to the stator solenoid. The solenoid then closes the switch and hence the larger amount of current is sent to the starter motor. The solenoid is directly connected to the battery. So a question came into mind that does the solenoid responsible for the drainage of the battery?

what is soleniod

The answer is NO

The bad solenoid is not responsible for the drainage of your battery. The bad solenoid is responsible for other issues in your lawnmower, for example, if you are in the mood to mow your garden but your lawnmower does not start after several tries, it means your solenoid is not working properly and does not provide the current to the stator and your engine does not start.


  • Engine of your lawnmower does not start or crank
  • No voice when you are giving ignition
  • Stator spins a little and suddenly stops


To troubleshoot the defective solenoid follow these steps:

  • First check the battery voltages.
  • Follow the red wire and check the voltages at the solenoid terminals. If the voltages are present in the solenoid terminals it means the battery provides the voltages to the solenoid.
  • Now you need to clean the battery terminals, and solenoid terminals for any carbon, rust, or moisture on the terminals and clean them properly.
  • After cleaning connect the wire connections to the solenoid and battery.
  • Try to start the engine if the engine starts it means your wire connections to the solenoid are not providing the current to the solenoid and after cleaning and tightening the connections it starts working.

Note: if the engine does not start after doing the above steps it means YOUR SOLENOID MIGHT BE DEFECTIVE AND YOU NEED TO REPLACE THE SOLENOID. The solenoid is not much expensive so you can buy it very easily locally.

The Importance of Solenoid and Battery Health

Think of the solenoid as a switch that controls the electricity from the battery to the starter. If it’s not working properly, it can cause the battery to drain quickly. Keeping the solenoid in good condition is important for your vehicle’s overall health and longevity.

Tips for Maintaining Solenoid and Battery

Routine Checks: It’s important to have your solenoid and battery checked regularly. This helps identify and fix any issues before they become bigger problems.

Clean Connections: Ensure the connections between the battery, solenoid, and starter are clean and free from corrosion. Use a wire brush to clean these connections as needed.

Battery Charging: Make sure your battery is always charged, especially if you’re not using your vehicle for a while. A battery maintainer can help keep the battery charged and ready to go.

Pay Attention to Signs: If starting your vehicle becomes difficult or you hear unusual clicking sounds, it might be a sign of a solenoid problem. Don’t ignore these signs.

Adhere to the Maintenance Schedule: Follow your vehicle’s maintenance schedule closely. It includes necessary checks and replacements that help prevent issues with the solenoid and battery.

Recommended Maintenance Schedule

To keep your vehicle in good condition, follow this simple maintenance schedule:

Battery and Solenoid Checks: Have these checked every 6 months or during regular vehicle services.
Terminal Cleaning: Clean the terminals twice a year or whenever you notice any buildup.
Battery Charge: Keep the battery charged regularly, especially if the vehicle will not be used for extended periods.

Frequently Asked Questions (FAQs)

Can a bad solenoid cause no power?

Yes, a faulty solenoid can lead to a loss of power in your vehicle. The solenoid’s role is to connect the battery to the starter motor when you turn the ignition key. If it fails, the electrical path is broken, and the starter won’t operate, leaving your vehicle without power to start.

What does a bad solenoid do?

A bad solenoid typically fails to engage the starter motor with the engine. This can result in several issues, such as the vehicle not starting, intermittent starting problems, or hearing a clicking noise when trying to start the car. Essentially, it disrupts the normal starting process of your vehicle.

What are the symptoms of a bad solenoid?

The symptoms of a faulty solenoid include:

Clicking sound when turning the key: This is often the first sign. Instead of the engine turning over, you’ll hear a single click or a series of them.
Intermittent starting issues: Sometimes the car starts, sometimes it doesn’t. This unpredictability can be a sign of a solenoid beginning to fail.
No response when turning the key: In more severe cases, turning the ignition key does nothing because the solenoid is unable to establish the connection needed to power the starter.

Can a bad starter destroy a battery?

Indirectly, yes. A malfunctioning starter can require more power from the battery to start the engine, draining the battery more quickly than normal. If the starter is faulty and fails to engage the engine properly, repeated attempts to start the vehicle can deplete the battery.

How do you test a starter solenoid?

To test a starter solenoid, follow these steps:

Safety First: Ensure the vehicle is in park or neutral and that you have secure parking brakes applied.
Locate the Solenoid: Usually, it’s on the starter motor.
Check for Voltage: Use a multimeter to check for voltage at the solenoid’s input terminal while someone else tries to start the vehicle.
Test the Output: Test the voltage at the output terminal to the starter. If there’s no voltage while attempting to start, the solenoid is likely faulty.
Listen for Clicks: While testing, listen for the click sound from the solenoid. No sound or a weak sound can indicate a problem.


The solenoid is the connection between the stator and the battery; it is working like a switch and is not directly responsible for the battery drain. In some cases, defective solenoids can cause current leakage and maybe drain the battery but it is not very common. But defective solenoid is very dangerous for your lawnmower because it is the main bridge to start the engine and if it is not working properly it will disturb your work and may be responsible for the fire in your mower engine because of heat up and defective coils. Therefore in case of a bad solenoid, you immediately contact your mechanic and find a possible solution. The mechanic will replace the solenoid in your lawnmower and you start your work again.

Naveed Aanjum author

About Naveed A Hashmi

In my childhood, I used to see my parents while working in the land, for these reasons today I have been serving the same as our own tradition and culture. I thus love to stay in it, because I want to learn something advanced and new so that I may improve my farm’s contour and help others with my experience.

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