Ignition Switch Connector Fail

Syleng1 said
In other words the damage - in this particular case is from too much draw or an over load of need for electrical amperage and not too much feed from alternator, other wise the wire from the alternator would had melted.

I think your conclusion is correct.

Syleng1 said
And correct me if wrong. The alternator B+ wire goes to the bulkhead plug to the amp gauge and from there it splits to the fuse box, and back out to the battery. The wire in question is the harness plug for the ignition switch? Right? After the fuse box.

This is not quite correct, but I don't think it effects the scenario.

The alternator B+ wire goes to the bulkhead plug.
Bulkhead plug to the main splice.
From Main splice
------> Feed to ignition switch.
------> Feed to Fuse box
------> Connects to ammeter (Feed from/charge to battery)

Basic 1960s power feed scheme is like this.

The general feed scheme stays the same in the 70s but with some differences
Obviously with the key switch in the column there's another connector.
'76 A-bodies have externally shunted ammeter and several fusible links.
By '76, if not before, alternator output is split before the bulkhead.