Good evening my fellow 7.3ers. Okay, if you can remember a while back, I was having an issue with fuse #35 blowing all the time.

Things on this fuse:
radio, "wait to start" light on dash, in fact most of the cluster , no rpms, no speed, interior light, power windows.

Everything but the items listed above work fine. The truck runs good. Starts good. Okay, now getting to the point. Last night I was driving home and it started to act up again but something different this time. Everytime I hit a bump or hit the brakes to slow down a bit, the interior light would flash. When I got home I started to play around with it a little bit to try and find out what action would blow the fuse and I had thought I had it narrowed down to the dome light. Everytime I would open the door it would blow the fuse and if I tried to stick another one in there really fast it would also blow but if I waited a minute roughly I could stick the fuse in and it wouldn't blow.

So today i got up, went out side, -10 today and started ripping out the back trim panel so I could pop the head liner to inspect wiring. I read in a previous thread that somebodyelse's had rubbed through the insulation on the wires and was shorting out on the roof. This doesn't seem to be my problem so I followed the wires down to the chanel along the door on the driver's side. I had to melt lots of ice to get everything out nice and easily and again no broken or burnt wires so I popped the cover off in between the door and the frame and inspected wires for breaking and cracking. I found 3 wires with cracked and missing insulation, however these wires had not touched due to their different locations. So I taped all these up and proceeded on.

Does anybody have the wiring diagram for this circuit? The three wires going to the interior light are:

black, stripe, light blue
black
green, stripe, yellow

Now I don't know what wire is supose to be hot. I have assumed black being ground. I've also noticed the black, stripe, light blue has lots of tie-ins so now that leaves me with green, stripe, yellow. Now I know there is a wiring harness that runs under the floor from the driver's to the passenger's side, I have not checked this harness though.

If there is any other information I can provide to help me diagnose this problem, pm me.

Thank you
Adam

 

Well i spent most of the day traceing black, stripe, light blue




from the interior light to the door across the truck to the other door cutting open to insp and trying to nerro it down as i go






well have nerrodown to a harnes going out the floor to the under side of cab


it look good now i complet retape all cab wireing and all clean under the floor mat

 

Wow, you've been busy...

 

Nice work.. Hopefully you'll find your issue soon !

 

well i took a look under the truck to day and yes i think i have found it. there is a harness that go over the fram rail right next to the transfur case and it rubed through the loom

 

Not sure if you still wanted to know, but the wiring manual shows black/light blue as the interior and cargo lamp and light green/yellow as the map lamps.

 

No expert on wiring but finding a spot like that and repairing it increases your chances you'll fix the problem, nice going...and great pics..

 

it took a some time to fuger that out yesterday when the fuse keep blowing evertime i put a new one in and i forgot to pull out the light bulbs when i furst started testing so every where l looked i found a ground with multy meater

the bulb complets the the loop back to ground

thank you anywase

 

Those shorted wires are a bear to find. nice work on finding it.

 

Great find ! I think you'll be good to go now and that fuse shouldn't blow after finding that mess ! Nice job !

 

Great Job!