1973 Scamp won't start in start only in run. With a Twist....

4 pin Mopar Unfortunately this is poorly drawn. "Existing wire" at far top right is IGN1. IGN2 is not shown, it taps in to the COIL+ side of the ballast. From the ignition switch/ ballast/ coil + is EXACTLY the same as earlier "points" cars

Ignition_System_4pin.jpg