Test Spark Plugs, Spark Plug Wires and Coils without puncturing the wire INSTRUCTIONS While the engine is running, place the grooved end of the tool over the spark plug wire , the bulb will flash to indicate spark.
Test Spark Plugs, Spark Plug Wires and Coils without puncturing the wire INSTRUCTIONS While the engine is running, place the grooved end of the tool over the spark plug wire , the bulb will flash to indicate spark.