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Attach the spark plug to a spark plug tester, then connect the tester to the ignition wire. Start the engine and observe the ...
It’s easy to make custom ignition wires, and it can be done with a few simple hand tools.
You can use a multimeter to test the resistance to be sure. Q: How Can You Tell if a Spark Plug Is Firing? A: The grounding test is performed to determine if a plug is firing.