Brake and Reverse lights not working

Hey Guys, Thanks for all the advice but they still won't work!!!! I checked the switch at the pedal (GOOD) and I checked the mounting area where the lights bolt to the bumper and I have no new paint where the mounting screws for the rear tail lights mount the lenses to the bumper. Does anyone know of any wire grounds that are in the rear for the tail lights that I might have missed, I looked but can't find any or any other reason I would have lost both of them lights (Brake and Reverse). Thanks Dave!!!!!!!!!!!