1988 Johnson Evinrude "CC" 9.9 thru 30 Service Manual, P/N 507660, Page 320Get 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 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 theOFF" position, connect the black lead of the tester to one of the "Mterminals of the key switch 1Attach the red lead apply leakage test
of the tester to the8" terminal and