OK so it has been 2 months, and I finally got around to trying to resolve my backup light issue. I have replaced both bulbs, and I have checked all connections in that area. I checked the only wiring harness connection that I could find on the back half of the truck bed. It all appears to be fine. I replaced the TRANS fuse (using a 10 in place of the 7.5, because it is all I had.) Still nothing ... where do you suggest I look next? By the way, all other lights appear to be working perfectly.