1990 Johnson Evinrude "ES" Colt/Junior thru 8 Service Manual, P/N 507870, Page 109Get this manual
17 STEPIGNITION PLATE OUTPUT TEST
To prevent accidental starting of engine while testing, twist and remove both spark plug leads
1Twist and remove primary leads from ignition coils
71 2Connect No.1 ignition coil primary lead to Stevens Instrument load adapter NoPL-88 red leadConnect adapter black lead to clean engine groundIf Stevens Instrument NoPL-88 is not available, you can make an adapter using 10 ohm, 10 watt resistor Radio Shack No271-132 or equivalent
3Set peak-reading voltmeter to "POS" and "500" 4Connect PRV meter red lead to adapter red lead and meter black lead to clean engine ground