Engine stops running with ignition button release

Working on an IH 2504 which is an operational tractor but developed a short from a broken black #14 ga. wire under the dash panel. I have now located that hidden wire preventing the starter from turning but have not reconnected it because I don't know what it does although it is hot. I'd like to cap it and forget it unless I can figure out where it belongs but it may be the clue to my problem.
Instead of an ignition switch, when I bought the tractor it came with a simple 2 wire kill switch and a 2 wire starter button setup completely separate from each other. Now that I've located the hidden broken black wire, finally, my engine cranks as normal and runs fine while I hold my starter button down. But when I lift my finger off the button, the engine dies immediately. Im certain I've run across this before but can't remember the solution. If you have an idea I'd greatly appreciate your thought. Thanks very much in advance. John
 
Your tractor has a ''starting bypass'' that takes a primary ignition resistor out of the circuit during cranking and the ''running'' ignition feed from the ignition switch through the ballast resistor to the coil is somehow not working.

You can find the factory wiring diagram on Page 35 at the link below.


https://cdn.compknowhow.com/carterandgruenewald/wiring_diagrams/IH 404-2404-504-2504.pdf

The ''starting bypass'' is the ''natural colored'' wire from the ''R'' terminal on the starter solenoid directly to the coils (+) terminal.

The ''run''circuit if from the ''IGN'' terminal on the ignition switch though a black wire that ends up at the resistor, ''RUN'' igntion power then flows through the resistor to the (+) primary terminal on the ignition coil.
 
Sounds to me that you know exactly what you're talking about and I'm not crazy after all. With your help I think I can get this done
and back on the road. Couldn't ask for a better answer and greatly appreciate your reply. You may be wore out but your brain functions
as good as new. Thanks a million. John
 
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