69 ignition problem???

Here is how this works. The ignition system gets "run" voltage from the ignition switch (usually dark blue) out through the bulkhead connector to one side of the ballast. Somewhere in there that wire is branched off to feed the voltage regulator, and depending on year/ model, "other things". Electric choke, smog doo dads, etc.

THAT WIRE GOES DEAD during cranking.

Cranking ignition voltage is supplied by a SEPARATE contact and wire in the ignition switch, the resistor "bypass" circuit, usually brown. That wire comes from the ignition switch, out through the bulkhead connector, to the coil+ side of the ballast resistor.

Either the ignition switch is bad, there's a break in the blue wire, or the bulkhead connector has a bad contact

You can download service manuals and aftermarket wiring diagrams at MyMopar. Some of those over there came from the guys right here