1998 Johnson Evinrude "EC" 90, 115 SPL Service Manual, P/N 520209, Page 232Get this manual
High Voltage
In some conditions, the key switch may be shorting (allowing 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 positionconnect the black lead of the tester to one of the "M" terminals of the key switch1Attach the red lead apply leakage test