1992 Johnson Evinrude "EN" 40 thru 55 Service Manual, P/N 508143, Page 131Get this manual
STEPRUNNING OUTPUT TEST
1Twist and remove primary leads from ignition coilsr,Q1 2install Stevens Instrument NoTS-77 terminial extenders, or equivalent, on Ignition cOIl primary postsr,Q1 3Install primary leads on terminal extendersObserve proper wire routingOrangeblue primary lead must be connected to the No.1 ignition coil
INotel Route all tester leads so they do not interfere with moving engine parts4Set peak-reading voltmeter to "POS" and "500"r,Q1 5C.onnect voltmeter red lead to No.1 terminal extenderConnect meter black lead to clean engine ground