Fuel pump wiring short. NEED HELP!

[pmcdon]

I am having a wiring short problem with my 97 explorer. The car died on my wife while driving it so she had it towed back. I checked the fuel pump and couldn't hear it running. So i swapped the relay with a known good one in the PCM and still nothing. Checked the fuse and sure enough, blown. So I swapped it with another one in the PCM and as soon and it made contact it arced. So I pulled the relay replaced the fuse and then put the relay back in and tried to start but nothing. Checked the fuse, and blown again. I traced the wireing haness from the PCM to the inertia switch back throught the firewall and then under the truck along the frame. couldn't find any evidence of wear or a short. I replaced it with my last fuse and it held out and the truck started just fine but started running a little rough. About a week has gone by and today it blew the fuse again. I tried swapping i out and it blew instantly. I climbed underneath and wiggled the wire along the rail and replaced the fuse and it started fine. Drove 3 miles and as I'm pulling into the driveway, it blew the fuse again. This time the first fuse replacement got it started again, but I tried to jiggle the wire along the frame to make it trip and it wouldn't.

I'm hoping that there is a common short in the wireing system for the fuel pump. Any help would be much appreciated as this is the only vehicle to transport my kids to school in.

Thank you

 

[pmcdon]

Update

Replaced the fuse again and with car running in the driveway I continued to wiggle the wires under the car for about ten minutes with no short. Finally I decided to look under the seat and with car still running about 5 minutes later the car dies. As I tried to pull the fuse I could see it arc several times while working back and forth.

 

[pmcdon]

Still need help

So I got the sar back up and running the last time that I made this post by changing the fuse but knew problem wasn't solved. The car died again today and replacing the fuse a couple of times didn't work. I am geting a 12v voltage across the fuse blade terminals which tells me there is a definate short. I started at the inertia switch and disconneced each connection all the way back to the relay, each time checking for the voltage to drop off. It never went away which tells me it should be fine. I opened the distribution box and checked the blue and orange tracer wire from the fuse terminal to relay and i looks fine. I did notice a white with light blue tracer wire coming off of the same fuse blade terminal as the blue with orange tracer. So I am thinking tha tthis migt be the source of my short to ground. The problem is that I don't know where it leads. Any Ideas would be much appreciated.

Thanks