1989 Johnson/Evinrude Outboards 88 thru 110 150 thru 175 models Service RepaIr Manual P/N 507757, Page 120Get this manual
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STEPPOWER
10 ohm, 10 watt
1114 Connect PRV meter red lead to adapter red lead and meter bIack lead to clean engine ground5 Crank engine and observe meter Meter must show 150