1998 Johnson Evinrude EC 5 thru 15 HP Four Stroke Service Manual, Page 306Get this manual
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 ofthe tester to one ofthe "M" terminals of the key switch1Attach the red lead of the test to the "B" terminal and apply leakage test2Repeat test by moving the red lead to each of the terminals and applying the leakage testThe meter will indicate if leakage is present3When applying test to other "M" terminal, turn key to the ON position