I've even removed all the bulbs and all the sockets and the fuse still blows. No melting, no corrosion. The driver’s side socket looks a little 'Dark' around where the bulb plugs in, but so did my 2002 Excusions (which didn't have any issues). Here is my understanding of the Gray/Orange wires. (Maybe I'm wrong, if so please correct me). There are two (2) identical Gray/Orange wires in the Main Wiring Harness coming from the front of the truck. These are the reversing lamp wires. They supply power to the 1) Trailer plug and the Taillight Harness with the wire going to the driver’s side brake
light socket. Important Note: The Taillight Harness wire from the Main Wiring Harness goes straight to the Trailer plug. The Taillight Harness wire from the Main Wiring Harness goes to a plug that plugs into the Taillight Harness.
Here are my tests:
1) I unplugged the rear Taillight Harness 'socket/plug', and connected the Trailer Harness Gray/Orange wire from the Main Wiring Harness directly to the Gray/Orange wire in the Taillight Harness. Well the Backup light works, and reversing sensor beeps (did not work at all before) no fuse blown. SO I'm thinking that the Taillight Harness Gray/Orange wire must be bad somewhere in the Main Harness and I'll just connect the Taillight Harness Main Harness wire to BOTH the Taillight Harness plug and the Trailer Harness. Fuse blows.
2) I figure let me get my reverse lights working (Main reason I went down this road) and the reverse sensor so I'll just use the Trailer wire from the Main Wiring Harness, remove the 'Pin" from the Taillight Harness Plug/Socket and put the Trailer Harness wire in the Plug/Socket instead. I'll worry about the Trailer another time. As soon as the Taillight Harness in plugged into the Main Wiring Harness, Fuse blows. So I figure it must be in the Taillight Harness, which I just ordered for $50.
It would be much easier for me to explain over the phone(###) ###-####