How To Test An Ignition Switch

| May 19, 2023 | Fix it | No Comments

If you’re having trouble starting your car, the problem might be with your ignition switch. But how do you know for sure? In this article, we’ll go over how to test an ignition switch so you can diagnose the problem and get back on the road.

What is an Ignition Switch?

Before we dive into testing, let’s make sure we’re all on the same page about what an ignition switch is. Essentially, it’s the part of your car that sends power to the starter when you turn the key. Without it, your car won’t start.

How to Test an Ignition Switch with a Multimeter

One way to test your ignition switch is with a multimeter. Here’s how:

  1. Disconnect the battery.
  2. Locate the ignition switch (usually near the steering column).
  3. Set your multimeter to the “ohms” setting.
  4. Touch one of the multimeter leads to the battery terminal on the ignition switch.
  5. Touch the other multimeter lead to one of the other terminals on the ignition switch (there should be two).
  6. Turn the key to the “on” position.
  7. If the multimeter reads 0 ohms, the ignition switch is working properly. If it reads infinity, there’s a problem.

What if the Multimeter Reads Infinity?

If the multimeter reads infinity, that means the circuit is open and the ignition switch needs to be replaced.

How to Test an Ignition Switch with a Test Light

Another way to test your ignition switch is with a test light. Here’s how:

  1. Disconnect the battery.
  2. Locate the ignition switch.
  3. Connect the test light to a ground (such as the negative battery terminal).
  4. Touch the test light to one of the terminals on the ignition switch.
  5. Turn the key to the “on” position.
  6. If the test light comes on, the ignition switch is working properly. If not, there’s a problem.

What if the Test Light Doesn’t Come On?

If the test light doesn’t come on, that means there’s no power going to the ignition switch. You’ll need to check the wiring and connections to see where the problem is.

FAQs About How to Test an Ignition Switch

Q: Can a bad ignition switch drain the battery?

A: Yes, if the ignition switch is stuck in the “on” position, it can drain the battery.

Q: What are some signs of a bad ignition switch?

A: Some signs include difficulty starting the car, the car stalling while driving, and the key getting stuck in the ignition.

Q: Can I replace the ignition switch myself?

A: It’s possible, but it can be tricky. If you don’t feel confident doing it yourself, it’s best to take it to a professional.

Conclusion

If you’re having trouble starting your car, it might be due to a bad ignition switch. By following the steps outlined in this article, you can test your ignition switch and diagnose the problem. If you’re not comfortable doing it yourself, don’t hesitate to take it to a professional.