tail/ brake/turn socket

65 dart. the sockets for the tail/brake/turn lights were froze. pentrant soaking to no avail. I got some a few months ago ( if I remember right) out of another 65 dart at buddys yard. yes, they have the black and green wires to them. cleaned up, correct 2 filament bulb slides right in. have the correct tail lite current going in the socket with the black wire, inside the socket, correct current there. yes lights up the small filament.

ok .. now.... I have the brake/ turn current going to and inside this socket. BUT the brake / turn lights up the SAME thin filament> NOT the thicker filament like it should. how in the world????? does this with both sockets...????