do your dash and radio lights work and dim properly?
That is WEIRD!Now here's where it gets weird........On my 1971, it is actually the side contact inside the console light socket that supplies power to the bulb (so try testing that with your light), and the center contact is the return path to ground. Not sure if yours is the same being an older unit, but something to think about. Good luck.
That orange off to the side is a little bent tab that makes contact with the bulb base.That is WEIRD!
From the looks of the socket the black is connected to the bulb center contact (straight in line with the bulb) while the Orange is off to the side.
I would love to get a clear shot down the inside of the socket.