1991 Johnson Evinrude EI 60 Loop V Models 150, 175 outboards Service Repair Manual P/N 507950, Page 117Get this manual
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STEP'POWER
adapter using
10 ohm, 10 watt
[!] 6 Connect meter red lead to adapter red lead and meter bIack lead to clean engine ground 7 Crank engine and observe meter: