Tailight problems help ASAP

I am having serious problems with my tailights, when I turn running lights on both blinkers on cluster are on an froze. When I turn on right blinker license plate light and a light behind the AC controls blinks. Very weird and I cannot figure this out I'm going crazy. The red with black wire behind the dash that people get messed up from stereo install where does that go? Any help would be awesome this is retarded that I can't figure it out.

Years ago, a friend of mine had a b2200 and lights did something similar.
A few days prior, he mounted a Maglite to the floor between the driver seat and the door.
As it turned out, he put a screw through the wiring harness that runs to the rear of the truck.

Have you done anything lately to that part of your truck?

I have looked everywhere and can't find anything. I had to replace a few wires due to melting but should be fine now. Had issues with front lights got that figured out yesterday now the rear. I have everything torn apart again I think has to do with the plugs on the steering column. Help help me please. Car show sat out here in Phoenix and won't be able to make it unless I get this figured out.

Based on your description I would lean very strongly to the actual headlight switch assembly under the steering column itself.Could be dirty and or worn out.I would remove the cover very simple four screws (in thought) and blow out with air if you can.I can only imagine the build up of lint,dust on it and sounds like it is grounding out due to poor contact explaining the problem.To remove this assembly requires pulling steering whl 4 screws backside of strg whl and then big nut on wheel.Remove and blow out or use some electrical cleaner( crc makes this) auto zone,advance, but in short could be the electrical side is worn out.Tired is setting in but just a general idea of what is going wrong.Ok

Thanks a lot I will try that in the morning I appreciate all the help