You (likely) don't have the wrong wire and this has been discussed many times. There is only one "run" voltage source in the enigne bay, and then there's the coil bypass circuit. "Run" is IGN1, and "bypass" is IGN2. You need to bypass the resistor and connect the old coil + lead to the small red
IGN1 feeds one end of the ballast, IGN2 goes to the coil end. By bypassing the ballast, both those are now connected together, and feed the small MSD red. The IGN1 is hot ONLY in run, and goes "cold" in start. The IGN2 bypass circuit is hot only in start, and was originally to feed "hot" battery to the coil during cranking
Also do NOT connect anything to the coil except the two wires from the MSD box. Not the tach, and not the old radio suppression cap
