Sounds like a bad ballast resistor to me. As stated. Put the key in the run position and I use a starter switch as a jumper. Put one lead on big terminal of the starter relay and the other smaller screw with hex head slotted screw. It should start right up if it’s the ballast resistor is bad. Most carry those as a spare. They go out all the time. You can jump those two post with a screw driver or pair of pliers in a pinch. It just engage starter is all.
I will reiterate, anyone that states the issue in this situation is the ballast knows nothing about how mopar electronic ignitions work.
It is bypassed in start,
The OP gets a bump when he releases the key and it returns to run, that tells you right there the ballast is ok.
