[57chevyman]

sounds like it may be a grounding issue. try running a ground wire directly from one of the bolts on the tail light bracket to the frame where the bumper bolts on. the tail lights are self grounding thru the bracket, but if that ground isnt strong enough, a separate ground wire may do the trick.

or you have wires connected wrong.

or both LOL. i feel your pain. wiring lights can be frustrating