Rear Lighting and Cluster Panel, Possible Wiring Issue
 

My 1993 Mercury Villager has an issue where I press on the brake pedal my Cluster Panel lights up. Even when lights are not on. Also if I turn my headlights on my all my back lights turn off. Even if I press the brake pedal nothing lights up. If I turn my lights to parking lights I have the back lights then. I was looking for a wiring diagram online but have not found it. If someone knows where I can find a diagram I would appreciate sharing it. If not I will just buy a manual.