Hi guys, back for more advice. The driver's side reverse lamp is out. It's not the bulb or the bulb holder, as I switched it out for the other side and it worked fine over there. When I took out the bulb holder, I thought it might be a little corrosion, but then I took the bulb holder out of the tail light just below it. The corrosion was much worse there and the lamp is working fine. I put some dielectric grease on the bulb holder contact points, on the wire terminal of the green wire, and on the metal pieces on the taillight assembly. No dice.

Any ideas. All the wires coming out of the wiring bundle look to be in good shape and all the other lights on that side of the taillight assembly are working.