So, I hopped in the truck to go back to work after lunch and it cranked for a couple seconds as usual, and just as it would have normally started the dash went dark, the cranking stopped and..... Nothing. I tried cranking again with no success. I've tried all 3 keys I have which previously worked. When the key is in the run position or while attempting to crank the "THEFT" light is either blinking rapidly or on solid. There is no Check Engine Light when the key is in the on position or while attempting to crank. I have not yet tested the PCM relay, nor checked the 30A PCM fuse, though I would expect that it simply wouldn't start, rather than not cranking. I've also tried disconnecting the battery for ~5 minutes and retrying, with no success. I do hear a relay clicking on and off beneath the dash on the drivers side of the steering column while the battery is connected. Any thoughts? I think that it's an anti-theft problem, but I'm not certain how to troubleshoot further. Gonna consult the service manual, but I was hoping I might get some guidance from users who might have had a similar experience. Search didn't yield anything particularly useful either. :-( Thanks in advance!