Fog lights don't work

[KLP 92]

I have one problem on my W124 Brabus CE. The fog lights in my front bumper don't work. When i switch my fogs on the fog lights in the main headlamp switch on but nothing from the fogs in the bumper. I have removed them and checked the bulbs which were fine. Theres no current coming from the wires at the back of them. I traced the wires to the back of the headlamp and they are connected to the back of the headlamp. So the wiring looks ok to me but still no current to the fogs. Any ideas??