Melted ignition connector

[Scottybbythesea]

I discovered that one of my connectors on my ignition switch had severely melted at some point in history. I went to the junk yard to pull another connector and noticed the exact same thing on the same terminal, though not as severe. Anyone have a clue what’s causing this and how I can prevent this from burning my beloved Comanche to the ground? 

[scaleless]

The wiring diagram colors are a crapshoot, but I think that pin supplies switched power for the blower motor.  You might want to complete Cruiser's blower motor ground tip, or perhaps you might need to replace your blower motor if it's constantly drawing too much current.