Magnum swap starts, does not run

The only wiring thing I would check is how/when pin 9 is getting power.

Just checked this with a multimeter. Was using a test light.
Pin 3 is 12V constant.
Pin 9 is 12V when key is on.
Numbers dip slightly when the starter is activated, as expected.

This weekend I'll check some other things in more depth. Thanks again.