1994 Johnson/Evinrude "ER" 2 thru 8 outboards Service Manual, Page 107Get this manual
Power Pack The power pack has three major functions: To receive its operating voltage from the charge coil and convert it into direct current for storage To store this direct current in capacitor To use series of electronic switches (SCRs), activated by sensor coil output, to select the correct ignition coil primary winding for firing The power pack has one SCR for each ignition coil it controlsStop Circuit The stop buttonemergency stop switch is connected to the power pack through the engine wiring harnessWhen activated, the switch directs the power pack output to ground, stopping the ignition systemThe steering handle contains combination stop switch emergency stop switch device When the clip and lanyard assembly is removed, the emergency stop switch is in the STOP position When the clip and lanyard assembly is installed, the emergency stop switch is in the RUN position To STOP the engine when the clip and lanyard assembly is in place, press inward on the stop button until the engine stopsIgnition Coil