73 Duster Electrical Issue

So far as your ignition. Regardless of the factory wiring there is two wires in the original car involved. IGN1 "run" is often dark blue. IGN2, ballast bypass, is often brown. These come from the ignition switch, through the bulkhead, out into the engine bay. The whole deal is, IGN1 "run" GOES DEAD during cranking. So you would have no spark!!!

But IGN2 originally was meant to bypass the coil resistor, and THAT is what gives you ignition power in cranking. So to run your add-on ignition, you must JUMPER IGN1 and 2 together and hook them up where the "key" is in the MSD diagram.

You must ALSO leave the alternator field and VR power in the mix, which is branched off of the "run" wire originally. Make sure you don't chop things all up and disable it---won't charge