03 F250 6.0 sudden Electric Problem!!!! Fuel gauge, outside temp and airbag

[jzuccone]

I have a problem that seems to have started when I plugged in a trailer that was incorrectly wired into my 03 F250 6.0. The Fuel gauge went to zero and has stayed there ever since, the airbag light is on and the overhead outside temp is off by at least 20 degrees. Also, when you lock the doors with the fob, the horn does not beep any more although the horn works when you press it normally.

I have replaced a blown fuse, unhooked the batteries to try to reset things, but to no avail. I checked voltage at the 12v accessory plug and it reads 13.2 volts with the engine running. Anyone have any ideas???