1997 Johnson Evinrude "EU" 9.9 thru 30 2-Cylinder Service Manual, P/N 507263, Page 130Get this manual
STEPPOWER PACK OUTPUT TEST
To prevent accidental starting of engine while testing, twist and remove both spark plug leads
1Twist and remove primary leads from ignition coils2Connect No.1 ignition coil primary lead to Stevens NoPL-88 load adapter red leadConnect adapter black lead to clean engine ground
INote If Stevens NoPL-88 is not available, you can make an adapter using 10-ohm, 10-watt resistor,
Radio Shack No271-132, or equivalent
3Connect peak-reading voltmeter red lead to adapter red lead and meter black lead to clean engine ground4Adjust voltmeter to settings listed in following chartCrank engine and observe meterMeter must show at least: Models 9.915 20 thru 30 Voltmeter "NEG", 500 "POS", 500 Output 175 175