I am trouble shooting my 68 GTO Conv. right now as well. I had a hydrolic leak though not really a wiring problem. What I have found is that there is a separate harness for the switch and top. They are red and green wires according to the manual and they are much larger than the std wire, my guess is 12 guage or so. My harness runs from the fuse block accessory spade to the switch. The two wires out of the switch run into the harness passage to the rear of the car and pop out in the trunk. When you turn the switch either up or down each wire in the trunk should have power. Sound like you have checked the switch, but most problems are in the switch. If not look for an in line fuse under the back seat or under the conv. top well, maybe someone at one time added a fuse to the system??
Good Luck
Hope this helps.
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