How do you test a Chevy ignition switch?

To test a Chevy ignition switch, you'll need to follow a series of steps to ensure the switch is functioning properly. This process involves checking the switch's continuity, voltage, and resistance to identify any issues that may be causing problems with your vehicle's ignition system.

Step-by-Step Guide to Testing a Chevy Ignition Switch

1. Locate the ignition switch: The ignition switch is typically located on the steering column or near the steering wheel. Consult your Chevy's owner's manual or repair guide to identify the exact location of the ignition switch.


2. Disconnect the battery: Before testing the ignition switch, disconnect the negative battery cable to ensure your safety and prevent any potential damage to the electrical system.


3. Access the ignition switch: Depending on the model, you may need to remove the steering column cover or other components to gain access to the ignition switch.


4. Check for continuity: Use a multimeter to test the continuity of the ignition switch. With the switch in the "off" position, there should be no continuity between the terminals. When the switch is in the "on" position, there should be continuity between the appropriate terminals.


5. Test for voltage: Check the voltage at the ignition switch terminals with the multimeter. When the switch is in the "on" position, you should see battery voltage at the appropriate terminals.


6. Measure resistance: Measure the resistance between the terminals of the ignition switch. The resistance should be within the manufacturer's specified range, typically between 0.5 and 5 ohms.


7. Interpret the results: If the ignition switch fails any of these tests, it may need to be replaced. Consult your Chevy's repair manual or a professional mechanic for further guidance.

By following these steps, you can effectively test the Chevy ignition switch and identify any issues that may be causing problems with your vehicle's ignition system.

Is there a way to test the ignition switch?

Yes, you can test an ignition switch using a multimeter to check for continuity and voltage at different key positions. To perform the test, set your multimeter to the continuity or ohms setting, and check that the switch has continuity between terminals in the appropriate positions (e.g., no resistance when the key is "on" between certain terminals). You should also check the voltage to ensure it's within an acceptable range, around 11-13 volts, to confirm the switch is supplying power. 
This video demonstrates how to check a switch for continuity using a multimeter: 47seSparesYouTube · Nov 6, 2012
How to test the ignition switch
Using a multimeter for continuity 

1. Disconnect the battery: and remove the ignition switch's wiring harness. 
2. Set the multimeter: to the continuity or ohms (Ωcap omegaΩ) setting. 
3. Attach the multimeter leads: to the appropriate terminals on the switch. You'll need to know which wires correspond to the "off," "on," and "start" positions. 
4. Test the continuity: for each position: 
   • Off: There should be no continuity between certain terminals. 
   • On: There should be continuity (zero resistance) between the battery and the accessories/ignition circuit terminals. 
   • Start: There should be continuity between the battery and the starter solenoid terminal when you are in the start position. 

This video shows how to test an ignition switch with a multimeter: 58sRiley Knife and ToolYouTube · Sep 30, 2019
Using a multimeter for voltage 

1. Reconnect the battery, but leave the ignition switch wiring harness disconnected.
2. Set the multimeter: to the DC volts (Vcap V𝑉) setting. 
3. Place the key in the "on" position: and check the voltage reading. A healthy switch should show a reading close to the battery voltage (around 11-13 volts). 
4. If you get a low reading or no reading, the switch may be faulty. 

Other checks to consider

• Inspect wiring: Look for any signs of damage, corrosion, or frayed wires on the ignition switch harness. 
• Wiggle the key: Try wiggling the key while the engine is running. If the engine stalls, the switch is likely the cause. 
• Check the starter: If the switch appears to be working, but the engine still won't start, you may have a separate problem with the starter or starter solenoid. 

How to check for a bad ignition switch on a Chevy?

To diagnose a faulty ignition switch, check if the vehicle fails to start or if accessories don't power on when turned to 'ON. ' Inspect the ignition cylinder for looseness or unusual resistance. Use a multimeter to test continuity across switch terminals in different key positions.

Can I spray WD-40 in an ignition switch?

No, you should not spray regular WD-40 into an ignition switch because it can attract dirt and dust over time, making the problem worse and potentially causing damage. It is best to use a graphite or dry silicone lubricant specifically designed for locks and ignition cylinders. 
This video demonstrates how to lubricate a sticky ignition switch with graphite lubricant: 56sTwoWheelObsessionYouTube · Jan 14, 2018
Why you should avoid WD-40

• Attracts dirt: WD-40 is a solvent and water displacer, but its oily residue can attract dirt and dust, which will mix with the lubricant to form a gritty paste. This can cause the lock mechanism to seize up, making the key difficult to turn. 
• Can cause damage: Its solvent properties can also potentially damage plastic components within the ignition switch, and its tendency to thicken over time is not ideal for lock cylinders. 
• Temporary fix: While it might provide a temporary fix, the long-term effects are negative and can lead to a more serious and costly repair. 

What to use instead

• Graphite lubricant: This is a dry lubricant that will not attract dirt and is ideal for lock cylinders. 
• Dry silicone spray: Similar to graphite, this is a dry, non-stick lubricant specifically made for locks that will not attract dirt and residue. 
• Contact cleaner: If the issue is dirt and grime, an electrical contact cleaner can be used to clean the contacts first, followed by a proper dry lubricant. 
• How to apply: Spray the dry lubricant directly into the key slot and work the key in and out several times to distribute the lubricant evenly. 

How to bypass a faulty ignition switch?

To bypass the broken ignition switch, locate the ignition harness behind the steering column. Identify the battery, ignition, and starter wires using a wiring diagram. Connect a toggle switch between the battery and ignition wires to power the vehicle's electrical system.