Ok here goes cranked truck put in reverse and truck died all within 20 seconds, found orange fuse link burnt up on the driverside fender it goes to a red wire that also has a white fuse link wire attached to it the red wire goes into the fire wall what does this red wire go to or operate thanks for any help you may give

 

I'm thinking that red wire goes to a clear block connector in the dash but not sure I got hot and tired of laying in the floorboard looking at wires I also a fuse in place of of the fuse link and it blows fuse soon as to turn key on to "wait to start" position so I know I've got a short somewhere ?? Thanks again

 

Just for grins and giggles, are you going to tell us what truck yer talking about, or are we supposed to guess?

 

93 w250 4wd auto cummins

 

93 w250 4wd auto cummins

 

Check your wiring going down to trans you could have a shorted out wire .

 

Ok, thanks ill check there later this evening and see what i can find

 

Do a search of "fusible links". there have been many posts about this. I believe that there is at least 1 thread in the sticky about taking care of this...Mark

 

Ignition switch powers a blue wired circuit protected only by a fusable link that goes all over, including the grid heater relays, the IP, and the transmission OD circuit. Lot's of opportunity for a frame short.

 

So I'm looking for a needle in a haystack haha

 

Not sure if this will be hard to read or not. I tried to keep the text centralized as best I could which is why I wrote so small. Not too long ago, I traced the wiring as best I could throughout the wiring schematics in the FSM for my '90 and labeled the fusible links with what I could find. Here's what I came up with. I've had a few others ask if I could put together a better layout including text. I'll do what I can as soon as I can and post a thread.

If you're certain it's the 12ga. Red wire on the other side of the 20ga., 40amp Orange fusible link, that powers some of the interior and exterior lighting.

 

Not really. Just look it up on the diagram and look for the blue wires.

It ain't rocket science, but it does take a little bit of thought.