Recently I've noticed that the rear lighting on my blazer is not working right. when the right turn siganal is on the both reverse lights and large light on the right side blink in opposite of each other. The left signal works fine. Also when I brake the large red light goes out and the small reverse light comes on only on the right side, while the left side works like it should when I brake, just lights up the big red. All of this only happens when the headlights and running lights are on, while no lights are on everything functions like it should. So where should I start looking fro the problem, is this a crossed wire or a bad switch? Thanks for the help and sorry if it is confusing.