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 Tools 6589 Electronic Ignition Spark Tester
OTC 6589 Electronic Ignition Spark Tester
OTC Tools Electronic Ignition Spark Tester 7230 NOS
OTC OMC Cobra Electronic Ignition Tester OMCD3200
OTC 7220-K Electronic Ignition Analyzer No. 7220-K
OTC 7220-K ELECTRONIC IGNITION ANALYZER
