Jeep

This could be a blown fuse. You have lost ignition between the switch and the coil. Trace ignition feed from ignition to ecm from there to the coil. Normally this is a fuse but not always possibly a bad connection at the bottom of the power distribution box or fuse panel. This prob won't be easy to find. But you just have to follow the power until it stops then try and determine why it stopped. Hope this helps feel free to reply if I can help

Yes that is a possibility. Usually it is not but an easy to test is connect test light to coil pos side turn key on, move key switch sligtly forward see if light comes on and goes back off light should be on on run and start position. Sometimes the switch will get worn and power the ignition at the wrong time. This could also be a power distribution box failure.