Just remembered.
Usually you can crank an engine without the harness to the shifter connected and run but not be able to shut it off.
This may help localise the problem.
Start the engine, then unplug the harness under the cowling and see if the problem still exists. In order to shut it off, you must plug it back up in order to use the key switch as the kill or off position.
Unless the wire you are describing is in that harness connection.
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'75 Cuddy with '00 Johnson Ocean Pro 150 horse
Benny
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