I have a 1985 GMC Sierra that has been having some brake light issues. At first, just the right taillight went out and I went to replace the bulb, but that wasn't the problem. I tested the assembly with a test light and everything was working, but then I had to put it in storage for a while and go to school so I didn't mess with it for a few months. Looking at it today, the left taillight won't work either, but when I put a bulb in the right taillight and put on the right turn signal, both taillights and my license plate light flash as if I have my hazards on. When I flip the left taillight, it doesn't flash. It seems like there are some wiring/ground issues, but I'm not sure and don't really know where to start. Any ideas?