1989 Johnson Evinrude "CE" 120/125/140/185/200/225/300 HP Service/Repair Manual P/N 507758, Page 146Get this manual
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114] STEPPOWER PACK TEST
If Stevens Instrument NoPL-88 is not available, you can make an adapter using 10 ohm, 10 watt resistor Radio Shack No271-132 or equivalent3 Set peak-reading voltm