Help Needed Fuse 45 keeps blowing

[RSG]

My truck had no throttle, figured it to be the throttle position sensor, replaced and no difference. Saw a thread in 7.3L section that indicated fuse #45 was in that circuit. Replaced it and sure enough, I had throttle (and dash gauges) again!!!

I was feeling pretty good until driving today. Sometimes, when I pull up and stop, still in drive and engine still on, the fuse blows. Not always, but 4 times today!!! Why?

Found the 4p wiring diagram (from library post, nice!) and fuse 45 feeds 4 lines:
1. APCM - aux powertrain control module
2. clutch pedal position sensor (I don't have a manual tranny, though)
3. Overdrive cancel switch
4. Throttle Pedal position sensor (looks like accelerator pedal switch, not potentiometer circuit)

What should I be checking to try to find this gremlin? Any thoughts on how to diagnose would be greatly appreciated. My wife thinks I should take it to the dealer, and I'm not so sure that is a fiscally responsible thing to do.

 

[dpantazis]

rich-
which library post do you mean?
dennis

 

[RSG]

Dennis, it is in the General area, and is a sticky. I figured out this problem (thanks for your help!) and posted the stuff under "Throttle Position Sensor" in the 99-03 7.3L section. It is pretty slick!!!

Incidentally, the problem *was* a chafed wire, one of 3 for the OD switch. Removed it all last night and fixed it with a butt splice connector (couldn't find the soldering iron, I love moving) and taped it up good. We drove around after I put it "sorta" back together and so far so good! I'll have to put the rest of the steering column assy back together still, if that cured the issue.