Unplug the plug wire, connect this part, clamp the tester to a good engine ground, crank the engine and watch for a spark. Check for spark on gasoline engines.
OTC 6589 Electronic Ignition Spark Tester
6589 Electronic Ignition Spark Tester
OTC OMC Cobra Electronic Ignition Tester OMCD3200
OTC 7220-K Electronic Ignition Analyzer No. 7220-K
OTC 7220-K ELECTRONIC IGNITION ANALYZER
