1992 Johnson Evinrude "EN" 9.9 thru 30 Service Manual, P/N 508142, Page 142Get this manual
STEPRUNNING OUTPUT TEST
1Twist and remove primary leads from ignition coilsf16l 2.l:'se .atwist to install Stevens Instrument NoTS-77 terminal extenders, or equivalent, on Ignition cOil primary postsf16l 3Install primary leads on terminal extendersObserve proper wire routingOrangeblue primary lead must be connected to the No.1 ignition coilINotel Route all tester leads so they do not interfere with moving engine parts4Set peak-reading voltmeter to "NEG" and "500"f16l 5C.onnect voltmeter red lead to No.1 terminal extenderConnect meter black lead to clean engme ground