Vehicle Fitment
Autocar
Crane Carrier
Diamond Reo
Duplex
Ford
Freightliner
GMC
International
Kenworth
Mack
Marmon Herrington
Peterbilt
Pierce
Spartan Motors
Sterling
Volvo
Western Star
White
Inline Spark Tester by Lisle®. Quickly diagnose problems with all ignition systems. Connect the tool between the spark plug and the plug wire. The tool is double-ended to offer a straight boot and a 90boot on one tool. With the engine running, the tool flashes a mirror image of ignition spark.