1fstblckgt

Its in the fuse box underneath the driver side dash.
Look in your owners manual under the fuse locations and diagrams. It will say something about anti-theft system. Pull that and then try to restart your car. If that doesnt work try to un-hook the batter cable, let it sit for about 10 minutes and then hook it back up and try again. If that doesnt work the last thing that i would ( this happened to me last time this occured on my car ) I thought the battery was bad so i put in a new battery still wouldnt crank, everything was going crazy. try wiggling your negative and positive battery cables. Make sure that they arent loose at all. Turned out that my positive side had corrosion on it and was really weak. it wasnt as tight as it should have been and so i pulled them both of cleaned the terminals and put new clamps on the positive and negative side. Fired right up. I hope this helps.

99mustang38or46

Everyone has great ideas! but it may be a reflash problem too. i did a motor trans swap v6 to v8 and i had the same problems the clicking and theft light all it needed was a reflash! hope that was helpful

InferRedd

Mine did the samething and it ended up being that the chip in side the key fell out. The car started then died quickly. But I found the chip...it was in the last place I looked!