check for recalls and TSB's if it happens again. I believe there was some kind of service message on these trucks to run a larger gauge wire from the ignition circuit to the blower motor. Im not certain on the years, but I know that my 2002 had it done. The original wires are dead in the harness and the dealership installed 2 new wires.
If Guns kill people, then pencils misspell words and spoons made Rosie O'Donnell fat...