what does a solenoid do
Rachel Hernandez
Updated on July 24, 2026
Solenoids are a type of electric motor. They are commonly used in cars as heavy duty relays. The technical definition of a solenoid is a device or motor that can produce back and forth, or linear, motion when a force is applied. Solenoids will respond to hydraulic, pneumatic or electrical force.
What happens when solenoid fails?
A faulty starter solenoid can exhibit several symptoms, including these: Engine doesn’t crank: This is a result of the starter solenoid failing to deliver power to the starter motor. No clicking sound: This can mean either a faulty starter solenoid or starter relay.
Is solenoid a coil?
A solenoid is a device comprised of a coil of wire, the housing and a moveable plunger (armature). When an electrical current is introduced, a magnetic field forms around the coil which draws the plunger in. More simply, a solenoid converts electrical energy into mechanical work.
What does a solenoid do on a motorcycle?
A starter solenoid is basically a switch that creates a contact point between the battery and the starter. When the starter button is pressed, it energizes the coil, which pushes a contactor to complete the circuit. This transfers DC current from the battery to the starter.
What causes a starter solenoid to burn out?
Abnormally high or abnormally low ambient temperatures to which a solenoid is exposed for an extended time may cause a solenoid to burn out. High Temperature. Coil insulation may be damaged and one layer of wire may short to the next layer.
Can you just replace the solenoid on a starter?
Yes it is true that you can often just replace the starter solenoid, but as a professional technician it’s not often done. Given that you have to remove the starter to do that repair it often makes more sense to replace the entire unit rather than just the solenoid.
Can you fix a solenoid?
Sometimes the high-voltage contacts inside the solenoid can burn, carbon-up or stick, resulting in a no-start condition. Replacing the starter solenoid with a new starter does not always have to be done. The solenoid lends itself to repair just like any other component, and savings can be realized by doing so.
How do you bypass a motorcycle starter solenoid?
Place the metal blade of an insulated screwdriver across both metal contacts. This bypasses the solenoid and creates a direct connection between the starter motor and the ignition switch.
When I try to start my motorcycle it just clicks?
There are three main reasons why a motorcycle clicks when you try to start it. The first and most common reason is because of a dead battery. The second reason could be due to a bad starter. The third most common but less likely reason the motorcycle is clicking could be due to a seized engine.
What kills a car starter?
1. Overheating or smoke – as a system configured for electrical functioning, the car starter is vulnerable to short circuits and blown fuses. When the faulty starter motor starts acting up, you may notice overheating of the car starter, which is usually accompanied by smoke.
How do you troubleshoot a solenoid?
We suggest you make yourself a checklist!
Solenoid valve doesn’t open / close properly. Check power supply and make sure voltage and frequency are correct. Coil burned out, melted or cold with power on. Check if the power supply is correct and the coil can dissipate heat by ventilation. Solenoid valve leaks.
What are the symptoms of a failing starter motor?
Trouble Ahead: 4 Signs of Starter Motor Failure
Buzzing Noise. If the engine doesn’t crank but a consistent buzzing sound that occurs when the key is turned, it usually means that there is a flow of electricity to the starter, but the motor is not actuating. Loud Clicking. Whirring Noise. Grinding Sound.