1965 Dart Charging System Question

Thanks for the detailed replies, Mattax. I bought the car from Wildcat Auto Wrecking, so anything in its history is possible! Some wiring looks like it might have gotten hot in the past. I checked the alternator stud with the engine running, and it held at about 0.2V above the battery. The ammeter reads just to the right of center when the engine is running; it stabilizes within a few seconds usually.

Rather than undoing the whole wiring harness under the dash, I'm thinking about just running a new wire between the ignition switch and the bulkhead connector. I think you're right in saying that there is nothing else between the two, at least if I'm reading my electrical schematic correctly. Am I right in thinking that the ignition wire between the ignition switch and the bulkhead connector is 16 gauge?