It goes into the wire harness at the drivers side before it disappears into the left quarter. When I was following the purple rear defroster wire in the trunk next to the package tray it reappears and goes back along with purple wire into the harness. No clue where the other end comes out yet. I was replacing the gas neck connector and clamps and found the red wire coiled up behind the trunk latch. It does not have a connector on the end. Must have been cut off. I also found the license plate light wire in the same location.
Don