Hello, I recently purchased this '06 XLT and it has a factory installed tow package. I have been trying to diagnose why I have no power to the 7 Round or 4 flat. I believe I have checked every fuse and relay that has anything to do with the trailer lights. The odd thing is that on the 7 round receptacle I do have 12 Volts flowing to the #4pin (heavy red wire, not used in the 4 flat or my 7 Round connector). My wiring is as follows, going clockwise and starting with the ground PIN 1 (White Wire, roughly 7 o'clock position), Left Turn PIN 5 (Yellow), Running lights PIN 3 (Brown), 12V PIN 4 (Red), Right Turn PIN 6 (Green), Trailer Brakes PIN 2 (BLU), center Auxiliary PIN 7 (Blu/brown). I do not use PINS 2 4 or 7. Except for PIN 4 none of the other pins are getting any power. I suspected a problem within the fuse box itself, even though FUSE #7 was OK, I thought power might not be flowing through it as that could explain my scenario. I jumpered the fuse and was able to verify that 12V was flowing through that fuse. Is there a plug somewhere that could be unplugged between the fuse box and the 7 Round that would not include the #4 PIN Wire (since it does have power) ? I am out of ideas on where the wiring is failing. ---thank you, any insight would be very much appreciated!