I did look at the fuse box wires and all are connected correctly, no corrosion. I have power to the fuses EXCEPT the taillight fuse. I will keep looking, there has to be a wire connected incorrectly or not at all. Thanks for your help.Haven't looked at the car yet.
But my 66 schematic does show a pink off the 2nd fuse on the block which goes to the lightswitch.
It's fed by a RED-Trace wire which should be battery power (unswitched)