1998 Johnson Evinrude EC 5 thru 15 HP Four Stroke Service Manual, Page 111Get this manual
1 DR5688
STEPRUNNING OUTPUT TEST
1Twist and remove primary lead from ignition coil
2Use clockwise twist to install Stevens NoTS-77 terminal extender, or equivalent, to ignition coil primary post3Install primary lead on terminal extenderRoute all tester leads so they do not interfere with moving engine parts
4Set peak-reading voltmeter to "POS" and "500"5Connect meter red lead to terminal extenderConnect meter black lead to clean engine ground