1990 Johnson Evinrude "ES" 60 thru 70 Service Manual, P/N 507873, Page 125Get this manual
15) STEPPOWER PACK TEST
To prevent accidental starting of engine while testing, twist and remove all spark plug leads
1Twist and remove all primary leads from ignition coilsf151 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 equivalent3Set peak-reading voltmeter to "POS" and "500 4Connect PRV meter red lead to adapter red lead and meter black lead to clean engine ground5Crank engine and observe meter Meter must show 230 volts or higher