1990 Johnson Evinrude 120 thru 140, 185 thru 225, 300 HP, P/N 507875, Page 322Get 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 terminalsWith 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 rw
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 present3When applying test to other "M" terminal, turn key to the "ON"" position