Hi to all,
I just solved the mystery. The switch on the steering column in my car works actually the opposite way than what I read on your site. I have the position and back lights on only when the steering column switch is on and the lights switch as well. Otherwise the position or tail lights do not work. When the ignition switch is off there is no way to run the position or tail lights on. I guess the car was just wired in such a way.