Hi, I have a problem with my trunk lighting, and the lamp does not light up when the stand light is switched on or I open the flap. However, the lamp lights up when I expand it and hold one metal part of the lamp to the metal of the hat rack (from below) and that even if the ignition is off and the stand light is off, so everything. How is the lamp normally switched on? And where does the 2 wired cables lead to the lamp? I am an electrician, but 12 volt vehicle electrics is a big mystery to me. If someone has switching plans of the Audi 80 B4 Limusine BJ ’94, especially from the trunk lighting I would be grateful for a transmission or any other help.