1990 Johnson Evinrude "ES" 9.9 thru 30 Service Manual, P/N 507871, Page 109Get this manual
Stop Circuit
r:J iAl The stop buttonkey switchand emergency ignition
cutoff switch are connected to the ignition module through the engine wiring harnessWhen activated, these switches direct the ignition module output to ground, stopping the ignition system
r::J The steering handle contains combination stop switch
l!J emergency ignition cutoff device
When the clip and lanyard is removed, the emergency ignition cutoff device is in the STOP position When the clip and lanyard is installed, the emergency ignition cutoff device is in the RUN position To STOP the engine when the clip and lanyard is in place, press inward on the assembly until the engine stops