What Is the Way to Test a 12-Volt Ignition Coil?

By Staff WriterLast Updated Apr 4, 2020 12:38:56 AM ET

In order to test the spark, pull the spark plug from the engine, and then start the car. There should be a bright blue spark between the electrodes every time the cylinder fires, provided that there is enough voltage reaching the spark plug. The coil is likely to be faulty if there is no spark.