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A screwdriver... with an insulated handle. Run the tip of the screwdriver along the wire about 1/4" away, if the wire arcs to the screwdriver, you need new wires.

Better still FIRST look for any signs of corrosion at both ends of the spark plug wire then use an ohm-meter to check for that wires resistance. If more than 15K ohms, replace that wire. Usually ALL thes spark plug wires do not all fail at the same time, but check them all especially if you have a misfire and take a look at the spark plugs.

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Q: What device is commonly used to test spark plug wires?
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