1988 Johnson Evinrude CC 60 thru 75 outboards Service Manual, Page 126Get this manual
Power Pack The power pack has three major functions: aThe power pack receives its operating voltage from the charge coil and converts it into direct current for storagebThe power pack stores this direct current in capacitorcThe power pack uses series of electronic switches (SCR's), 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 controls There is one power packStop ButtonKey Switch
The stop button or key switch and emergency ignition cutoff switch are connected to the power pack through the engine wiring harnessWhen activated, these switches direct the power pack output to ground, stopping the ignition system