Not getting 12v to coil on start ('73 Dodge W200 360La)

I ran a wire from the starter side of ballast to the trigger for the msd, worked like a charm. I must have broken the old wire somewhere on the inside when I was changing the connector.

You pulled this off the "start" wire? Be careful that will try and backfeed. The coil circuit will try and engage the start relay in park or neutral, and "draw down" the coil voltage if "NOT" an MSD You might have to put in a series diode in the new wire. About 10A 24 or more PIV to be safe