1990 Johnson Evinrude "ES" 9.9 thru 30 Service Manual, P/N 507871, Page 125Get this manual
1101 STEPRUNNING OUTPUT TEST
1Twist and remove primary leads from ignition coilsf1Ol 2in .a install terminal extenders Stevens Instrument NoTS-77 or to Ignition coli primary posts
f1Ol 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 f1Ol 5PRV meter red lead to No1 terminal extenderConnect meter black lead to clean ground