Re: 67 Camaro Convertible rear light wiring harness routing.
Is there a specific reason you want to replace the whole harness? The wiring diagrams you are waiting to receive are exactly what is in the 67 AIM which I think you have downloaded already. If not, search "digital assembly" here and download from one of the current links toward the end of the multi-page thread.
There are at least three or four separate harnesses, depending if your car is a power top and/or has the optional trunk light.
The "intermediate" or "front to back" harness is the one that connects to the main underdash harness behind the top of the kick panel or under the dash as described above (67 AIM electrical UPC section will show exact location for 67 model).
If you have a power top, there is a separate harness for that. Should be covered in the 67 AIM under the power top RPO number.
If you have a trunk light, there is a separate harness for that too. Covered in the 67 AIM for auxiliary lighting RPO U- something.
The front to back harness runs into the trunk, and has a plug on the driver side where the rear lighting and fuel gauge harness connects. Again, shown in 67 AIM in electrical UPC section.
If you are having some specific electrical problem and need to inspect/troubleshoot, if you tell us what is happening we might help you focus.
If you do end up needing to uncover the whole front to back harness, you should not need to pull the driver seat. You will have to take off the sill plate on the driver side, remove the driver side kick panel (which will also involve removing the parking brake assembly, and a whole lot of pulling and cursing and probably bleeding), plus the back seat bottom and top, plus the upper cover and armrest on the driver side. You will probably have to pull the rear door opening windlace loose at the bottom if the carpet is tucked under, but once all that stuff is removed, you can roll the carpet up along the driver seat side and then remove the screws that hold the galvanized wire gutter covers in place over the channel the front to back harness is secured in.
69 'vert project big block/TKO 600 RR
68 'vert driver RS clone -- gone!