upgrading regulator

No brown should be IGN2. That is the way they are normally labled at the switch. Let me dig up the factory diagram............

You say you have a 67?

OK lol, I forgot they didn't label those wires ign1/ ign2 back then. J2/ J3, here is right out of "the book"

67Dartengine1.jpg

The one that is "run" is "N" down at bottom left in the bulkhead connector J2-16DBL is the wire, this goes right through to the ignition switch. J2 is the run circuit. J2 does not "stand for" anything it is just a number, but that is the number they use for that wire