How to Test a Starter Solenoid

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The starter solenoid is an electromechanical device used to shift the starter motor pinion gear to mesh with the engine flexplate or flywheel. When current is supplied to the solenoid ignition terminal, the magnetic windings inside are energized. This creates a magnetic field that pulls the internal plunger, which in turn moves the linkage to engage the starter. The solenoid plunger contact disc also closes the circuit between the battery and starter motor.

Modern starter solenoids are attached directly to the starter motor. In most cases, when the solenoid fails, the entire starter is replaced.

Part 1 of 2: Locate the starter solenoid

In order to safely and efficiently replace your starter solenoid you need a couple of basic tools:

Step 1: Jack up the vehicle. Jack up the vehicle and support it with jack stands.

Step 2: Locate the starter solenoid. The starter is typically mounted to the bellhousing on the underside of the engine. The starter solenoid is mounted on top of the starter.

Part 2 of 2: Test the starter

Step 1: Locate the starter ignition terminal. Locate the starter ignition terminal. It will often have an electrical connector attached to it and will be the smallest of the starter terminals. It is often referred to as the starter “S” terminal.

Step 2: Attach the jumper wires. First, attach the jumper wire to the starter ignition terminal. Then, momentarily touch the other end of the jumper cable to the battery positive terminal of the starter battery (“B”) terminal.

If the solenoid and starter are working, the starter will engage and crank the engine over. A safer way to perform this test is by using a dedicated remote engine starter. This tool is hooked up the same way but provides a button to push for starter engagement.

  • Note: The starter battery terminal has power going to it at all times. Be sure not accidentally ground it while performing the test or injury could result.

Step 3: Lower the vehicle. Once testing is complete and you’ve performed any necessary repairs, remove the vehicle from the jack stands and lower it.

If this sounds like something you’d prefer to leave to a professional, contact a professional technician, such as one from YourMechanic, to replace your starter for you.


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Average Rating

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Number of Reviews

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Rating Summary
4,987
155
27
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4,987
155
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16
67

Benji

21 years of experience
103 reviews
Benji
21 years of experience
Hyundai Santa Fe - Starter - Chandler, Arizona
Just wish I could have found Benji sooner. Very pleasant and extremely friendly and knowledgeable. Dont ever let this Gentleman get away, he is awesome. Thank God for Benji....!

Cornelius

17 years of experience
71 reviews
Cornelius
17 years of experience
Kia Sedona - Starter - Union City, Georgia
Corneliuss , was punctual! Very professional and efficient. In the future if we ever need work done I’m confident that he will get the job done!

Attila

18 years of experience
519 reviews
Attila
18 years of experience
Mitsubishi Galant - Starter - Highland Park, New Jersey
Attila is an expert, fully professional mechanic. His attention to detail is superb. If that weren't enough ...he is honest as the day is long and gives you a true assessment of your vehicles condition. He is my preferred mechanic and will request him for all future vehicle services. - J.Kuhn

Bill

31 years of experience
29 reviews
Bill
31 years of experience
Honda Accord - Starter - Littleton, Colorado
Bill did a fantastic job identifying and resolving the issue I had with my car. I needed a new starter and he worked with me any my schedule to get the work done quickly and properly. He even went out of his way to talk to me about what was going on and how my car works. I learned a lot about my car and the fixes he made. I think Bill is a fantastic and knowledgeable mechanic.

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