So, this is going to be a long one,as I'll start from the beginning. I have a 2005 F250 with a 5.4 in it. Several weeks ago, I was driving home one night, and the truck sputtered briefly and died. Cranked it a few times, and decided to push it to the nearest parking lot. While waiting for a ride, I cranked it over a few more to times, and consequently, heard this sizzling sound from behind the cab, and then under the hood. After that, the battery was completely drained, but after a few minutes had enough to operate interior lights and radio. Took the truck home, put it on our Actron Scanner(Same as advance auto or autozone uses) and pulled some fuel related codes and a ground wire code. Replaced fuel pump fuse in interior fuse panel, fuel pump modual and ground wire by the module, fuel filter, and after ruling all else out, the whole sending unit assembly with a Bosch assembly. Fired right up. Took it for a test drive, and ABS light was on, tow/haul flashed, speedo didn't work and odometer would check out, but tach worked and shifted fine, but radio would be on AM when key was put in and turned on, and battery would be randomly drained. Scanner on, pulled P0500 and P1502. Replaced rear axle speed sensor, took for a test drive, same thing. Ordered a ford wiring diagram book. After testing and checking, found that the fuse that gives power to the two 60amp fuses for the ABS module wasn't seated and if the key is held just right, the beeper for when the door is open will not beep.. Fixed the fuse issue, took for a test drive, and truck died after 5 miles, just like you pulled the battery out it. Tried to crank it, no power, opened the door,and shut it for a car to go around, tried to crank it, and started up but spit and sputtered. Got it home, put on scanner, no codes. I think I've narrowed it down to the wires under the Junction Box, as I pulled the ignition switch out, and hooked the positive terminal back up and then the negative, and it arcs, indicating to me, there is a draw, but it has to be from the battery to the key switch. Anyone have any ideas or insight? Sorry for being so long, but I thought I'd include everything on the situation, might help someone too. Thanks in advance for any help.