I bought a '99 Explorer XLT that was wrecked and had no key. I got a ignition switch from another '99 Explorer and put it in. Then I had a locksmith come out and program the PATS system for the key that came with the ignition switch. He also programmed the keyless remote that came with the key. It stared fine many times after programed until I started doing some work on the Explorer. I unhooked the battery before I began the work. While drilling the spot welds out under the passenger side front door, I knicked a couple of the wires in the harness that goes down the passenger side. Well I taped them up and welded the new rocker panel in. After I was done with that I hooked the battery back up and now the Exploerer will crank but not start. The theft light flashes while trying to crank it. While I have to have the key reprogrammed? I checked everything and can't figure out what is going on. This is my first Explorer and don't know much about the PATS system. Can anyone please help me???? Thanks.