1992 Johnson Evinrude "EN" 40 thru 55 Service Manual, P/N 508143, Page 141Get this manual
16 DR4257
STEPRUNNING OUTPUT TEST
1Twist and remove primary leads from ignition coilsf16l 2.aclock':'Visetwist to install Stevens Instrument NoTS-77 terminal extenders, or equivalent, on Ignition coli primary postsf16l 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 toNEG" and "500"f16l 5C .onnect voltmeter red lead to No.1 terminal extenderConnect meter black lead to clean engme ground