Turn Signal and Brake light

[ai6908]

Ok here is the weird problem. I have a 94 xle. Whenever i hit the brake and put on my left turn signal, it blinks fast. I have noticed that the front one work, but the back one is real dim. It also makes the left brake lights dim, hence the brake light off signal in dash comes on. It had been doing this for a while, then stopped and now its back again. Also, this happens no matter if i have the head lights on or not. Has anyone had this problem before, if so please help. If not any sugessions on what to help would be appreciated.

I have posed before that my temp was rising whenever i stop at light. Someone suggested to change thermostat, I tried, but it didnt work. My car has new radiator, water pump and all brand new hoses. Any more sugessions here? Thanks a bunch people.