JCL, I suspect you have nailed it as that is what I thin is going on because with a test light I do not have a hot wire working.

I installed the wiring harness years ago and my memory is not so good. It seems all I did was splice in to the left rear tail light harness. Do you have any idea what fuse I need to track down? Would it be in the fuse box in the glove box, or the one in the right rear quarter panel? Or is there another place to look?

Thanks in advance for any insight.