Anyone Know What this Connector is Called?

65 Dartman said
As you said the flat connector in your first post went through the bulkhead connector on the right which appears to be somewhat melted. If so it should have had a 12 gauge wire that probably went to the ammeter. 63 and 65’s were the only A Bodies to use a solid terminal like. By the 65 FSM the other terminal goes to the battery circuit, not a ground

I believe it was a 10 gauge wire connecting to the ammeter. I had replaced it due to a bad (webbed) wire originally in the car from the time I purchased it. It seemed to work perfectly fine and has for several months until recently I noticed when I went to inspect why it was smoking that the connection of that 10 gauge wire to the ammeter was crimped poorly, my own fault and I believe that was what was causing the gauge to heat up and smoke to the point it fried the gauge and wire.

Old gauge is crispy now in the back side. My belief if that had the connection been secure and not coming in and out the inside of the gauge wouldn't have melted together and shorted and I may not have had this problem to begin with though like I mentioned I'm pretty green so I could be mistaken.

Could someone suggest why the positive wire would be fried but the black connecting to the battery circuit wouldn't be?