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1977 85 hp johnson no spark

I am absolutely positive that

I am absolutely positive that I am reading millivolts. 22mvs with the red cannon disconnected at black / yellow wire.
With red cannonon attached & key off. I have no voltage at all. With the key on I have 300 mvs. I have disconnected all ground wires besides the black one on the switch. I am lost.
So if I leave the black yellow wire off the power pack when I turn key off the motor will continue to run?
 
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