Flickering tail lights/ fog lights/ corner lights.. HELP

[scottsdale]

A couple days ago my turn signals/ fog lights (everything tha comes on with the middle spot in the headlight knob) started flickering when the headlight switch is in the off position. If you turn the knob to the middle or turn the headlights on everything is fine, the problem only happens when the truck is running and the headlight switch is all the way off. I converted to custom HID projectors awhile ago but it seems like maybe my headlight switch is bad??? Any Ideas?