1991 Johnson/Evinrude Models "EI" 40 thru 55 Service Manual, Page 270Get 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 ohmmeter This 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 test The meter will indicate if leakage is present3When applying test to other "M" terminal, turn key to the "ON" position
Start Switch Ohmmeter CheckTE, TTL
Disconnect the two switch leads from the starter solenoidCalibrate ohmmeter on appropriate scaleConnect one meter lead to switch yellowred lead, the other meter lead to switch red leadDepress switchMeter should show: Low reading when the switch is depressed High reading when the switch is releasedReplace the start switch if your results vary