If I understand what you did?????
You used the "crank" or "start" wire feeding to the start relay to act as an ignition bypass?
You CAN NOT DO THIS unless you put a series diode in the wire leading to the ignition. That's because the ignition -- when running -- will backfeed to the starter relay
It should not be that difficult to trace down the original wire---don't you still have the factory connector coming off the ign switch, in the steering column?