Someone just asked this the other day. I goes from the gauge cluster down to the left kick panel connector, into the harness to the rear. Back to the rear in the trunk. Through a grommet in the trunk floor up near the seat on the "step" in the trunk, and down to the tank You can look up the wire color in a shop manual, which you can download, free from MyMopar. It's the only wire branching off of the rear harness, by itself, with a rubber 90 connector