So you think maybe a fault in the alternator is/was the only fault? Maybe your aftermarket ignition addition was drawing too much current on the blue wire?
This same connector meltdown does happen in bone stock examples. Mostly in those that have electric choke assist added to the barely adequate wire and connectors. No alternator fault found.
In my opinion, every owner should cut the blue wire just beyond the bulkhead connector and add a relay there, along with fuses in the branch circuits. Afterwards, a fault in the electric choke, alternator, ignition system, will blow the added fuses or melt wires only to the relay and not into the cabin.
There have been cases where the wire that feeds the fuse box is melted down. Combined amp load of a/c, blower, wipers, etc..., can overheat this wire but it is less common due to those being fused branch circuits.
The blue wire feeds a bunch of stuff without a fuse in any branch ( other than the spot on a inst' panel circuit that serves as a fusible link ).
Bottom line... No matter how you go about repairing the ignition switch harness connector meltdown... add a relay to blue.
Get full 12 volts to charging system components and ignition system components.
And by the way... I don't know what year model started the engine harness connector near blower motor so you should look for and inspect it. These meltdown also. This connector was added only for universal ease of assembly ( The different engines would plug and play ).
We can clip, crimp, solder, and heat shrink to delete this connector.
