1988 Johnson Evinrude CC 60 thru 75 outboards Service Manual, Page 271Get this manual
3 Connect voltmeter positive lead to starter solenoid, starter lead terminalConnect voltmeter negative lead to starter motor terminalTurn key switch to start engineVoltage reading should not exceed .2 volt
4Connect voltmeter positive lead to battery negative lead common powerhead ground screw Connect voltmeter negative lead to battery negative postTurn key switch to start engineVoltage reading should not exceed 0.3 volt