1988 Johnson/Evinrude "CC" 40 thru 55 Models Service Manual, Page 264Get this manual
Key Switch Check, High Voltage
In some conditions, the key switch may be shorting (some leakage) to the other terminals in the key switch, but will not show up with test light or an ohmmeterThis condition may be found by using condenser tester (leakage test) where voltage of approximately 500 volts is applied to the key switch terminals With all leads disconnected and the key switch in the "OFF" position, connect the black lead of the tester to one of the "M" terminals of the key switch1Attach the red lead apply leakage test
of the tester to the "8" terminal and
2Repeat test by moving the red lead to each of the terminals and applying the leakage testThe meter will indicate if leakage is present3 When applying test to other "M" terminal, turn key to the "ON" position