Were the tail light wires covered? Am I correct they were just oriented by the inner wheel house.
Along the undersides of the drivers side quarter panel from the end cap/quarter extension attachment panel to over the wheel housing the wiring is covered with a woven/basket weave covering (multi colored) and is held in place by a couple of metal extensions/tabs welded to the bottom of the trunk lip on that side
The gas tank sending unit wire meets the loom up in the general area over the back half of the wheel housing
This covering protects the wires and keeps them together all the way forward to about the drivers side A pillar and back to the passenger taillight