How To Test And Ignition Switch

By | December 27, 2021



Ignition switches are vital components of any vehicle. They're responsible for sending power to the engine, and they need to be tested regularly to ensure they're functioning properly. If a switch isn't working properly, it can lead to all kinds of problems, such as your car not starting, or running rough. Testing an ignition switch isn't difficult, but it does require some know-how. In this article, we'll take you through the steps to properly test and diagnose an ignition switch so you can get your car running in no time.

The first step is to check the wiring. Check the wires going from the switch to the starter, and make sure they are intact and connected properly. If you see any corrosion or fraying, replace the wires immediately. It's also important to check for power coming into the switch. Use a multimeter to test for voltage; when the ignition switch is turned on, you should see 12 volts at the switch itself. If there is no power coming in, there may be an issue with the fuse or the wiring leading up to the switch.

Once you've verified that the wiring is in good shape, it's time to move on to the actual switch itself. Start by removing the switch from the car. Make sure to take all necessary safety precautions, as the switch may be hot due to electrical current. Once you have the switch out, use a multimeter to test the continuity of the wires. If the meter shows no continuity, the switch is likely faulty and needs to be replaced.

Next, you'll need to test the switch's internals. Using a screwdriver, carefully open the switch and inspect its components for any signs of wear or damage. Pay special attention to the contacts, as these are what activate the switch when the ignition key is turned. If any of the contacts show signs of wear or damage, the switch should be replaced.

Finally, you can test the switch's performance. To do this, apply 12 volts of power to the switch, then turn the key to the "on" position. If the switch is working properly, the power should flow freely and the car should start. If not, the switch may need to be replaced.

Testing an ignition switch is an important task that should be done regularly. Taking the time to properly inspect and diagnose an ignition switch can save you a lot of hassle and money down the road. With the right knowledge and tools, anyone can learn how to test and diagnose an ignition switch.


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