99 expedition triton v8. Think I am experiencing a short, fuse, or keyfob issue. The vehicle will not start. I have what I believe may be a dealer installed sarting circuit interuptor. I have always had to push the unlock tab on my key fob in order to allow the engine to be start. Now when I push the fob nothing happens, meaning doors do not unlock, and turning the key to start does absolutly nothing. Also pushing the door lock and unlock button on the interior doors does nothing at all. I did replace the battery in the fob w/no success. Also I can start the vehicle with the key in the on position and jumping accross the voltage regulator. Any ideas?