Key on and cranking power wire?

If you are NOT using a Mopar factory ignition switch, there are a few ways around the problem............

If you need a "hot" source in "start."

DO NOT just hook to the "start" wire as this will cause a backfeed situation in "run."

You can........hook a sizeable diode in series off the start terminal and use that for your source, just parallel it with "run."

You can........use the later model "Jeep" starter relay which has one more terminal and use that terminal

You can......use some other relay and just parallel the coil of the second relay right across your starter relay, so it "comes alive" with the starter relay, then power the contacts from a battery source, and the other contact goes to "run."