1991 Johnson/Evinrude Models "EI" 40 thru 55 Service Manual, Page 132Get this manual
10 STEPRUNNING OUTPUT TEST
1Twist and remove primary leads from ignition coils
install terminal extenders Stevens Instrument NoTS-77 or f1Ol 2",:wisting in .a equivalent, to Ignition coli primary postsf1Ol 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 parts
4Set peak-reading voltmeter to "POS" and "500