ITEM NAME:Car Spark Plug Tester Ignition System Coil Engine Inline Autos Diagnostic To Hn.2 connect the black head of the tester to the spark plug. 1 x Spark Plug Tester. Turn off the engine and remove the spark plug coil. The tool connects between the spark plug and the plug wire. Quickly diagnose ignition system problems, lack or no spark condition.
