I need another cup of sugar/wiring diagram. Do you happen to have the wiring diagram for the rear harness that controls the tail lights?
I went to the house last night before meeting up with some friends so I did some looking around for a bit. I looked everywhere for maybe a ground I missed or some kind of clue and came up empty handed. I was a pretty short visit so I didn't get to do much. So now I'm just figuring how I'm going to start tracing all stuff to get to the bottom of the problem.
Here ya go buddy! See attached.