ITEM NAME:Inline Ignition Spark Plug Tester Car Motorbike Motor Lawn Mower Sparkplu FJI.1 Turn off the engine and disassemble the spark plug coil 2 Connect the black tip of the tester to the spark plug. Product List: 1 Auto Spark Plug Ignition Tester. Spark Plugs. 5 If the ignition wire is intact, the indicator light flashes.
