I bought a used 2003 F150, 4x4 with 5.4 engine. Came with 1 key and had no problems. Battery got disconnected, now I have radio, odometer, and hazards flashing when vehicle is running. Truck starts and runs fine. Lights flash for 30 seconds, then are steady for 10, then repeats. Took it to dealer to get another key cut and programmed. Dealer said the truck kept locking up their computer and wouldn't program key. I have no history on truck as I just bought it, and previous owner didn't have it long. Researched this problem on the 'net and can't find these specific symptoms or what to try. Any help/suggestions appreciated..