Hi,
I've compared the wiring of the Saturn Sky Redline and the Opel GT version.
There have been only a few changes like different wire colors and different wiring for the left and right stoplight.
As you know the Saturn stoplight has it's stopsignal on the turninglight wire, which is prohibited in Europe.
Opel connected two additional wires (one for the left and one for the right stoplight) with the center stoplight wire and used a relay plus a fuse to protect the center stoplight.
So the Opel connector has four wires and the Saturn one has three.
In the near future I want to replace the Opel taillights with the Saturn ones and I need to see how the Saturn ones are working in all situations.
I hope there is still a signal on the turninglight wire I'll check that out, but maybe I'll have to reprogram the BCM.
Can some post a vid of the Saturn taillights?