Excess current in Ignition 1 circuit?

..........Every electrical component was deemed at least minimally adequate when the car was new. This includes the white plastic connector in question. .................Maybe there is/was a method to the madness in the fact that they made this one and the connector at rear of right valve cover from white plastics .

I understand what you are trying to say, but the plastic HOUSING is not the cause of the heat. Regardless of the connector housing, the terminals inside are what are inadequate, as the infamous bulkhead connector has shown.

In retrospect, when I "was a kid" one of the best things I should have done was to stop by the state patrol garage and see "what they did" to electrically equip a patrol car!!!