Tail light issues on my truck

chevynation

I have a 1995 Chevy Silverado Z71, I am having problems with my tail lights where when my headlights are on and I hit the breaks the driver side tail light completely turns off, if I use the left blinker it blinks very fast up till I hit the breaks. When my headlights are off they still don't work properly but legal enough, the left blinker blinks in between fast and slow and when I use the brakes the left side works but very dim, the wiring is all original never tampered with, all I did was put aftermarket tail light covers on it which shouldn't affect anything. The problem usually comes and goes but this last time it lasted for 2 months and now everything works perfect, the problem will be back and I'm afraid I'll run out of luck and a cop will finally notice it. Any help would be very appreciated.

Mr_Shiftright

I wonder if you dislodged a ground wire back there.