HELP! Blowing ignition switch fuse
#1
HELP! Blowing ignition switch fuse
I have a 2004 Lariat 4x4 with a no start condition. I had lights, but it wouldn't crank. I then discovered that it would not shift out of park. Turns out that it had a blown fuse. I did not have any of that type (the funky square 20a fuses) so I pulled the heated seats fuse (30a) and threw it in there, tried to start it and blew it right away. Is there a common short to look for on these? I believe that the guy that owned it before me had a satellite radio in it, and could it be a bare wire from that setup possibly blowing the fuse? Thanks for the help guys! Just trying to get a head start on tracking down the short.
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Anyone looking for a wiring diagram, I found a downloadable PDF file for a 2005 F150 here....https://docs.google.com/leaf?id=0BxB...ut=list&num=50
#7
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#8
So you've had the same no-start issue for over a year and haven't solved it? So your truck is just sitting there?
Stewart
Stewart
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I have the same ignition fuse problem. Continually blows fuse 113, took it to the dealer who replaced the starter and fuse panel, only for the problem to come back a month and a half later. I'm just telling you this because I doubt it is the panel or the starter but I guess it could be on yours. extremely frustrating as I NEED my truck for work. If anyone else has any Ideas they would be GREATLY appreciated
#13
Shorts
I have traced a few of these issues over the years, not F150's but the same principles.
Torino - turned out to be a bent pin on the harness connector where it went through the firewall.
Couple of others it ended up needing a ohm meter and wiring schematic. Started going through the circuit and at each connector, disconnected it and checked each section whether it was grounding or not. Very slow and time consuming but didn't have many other choices. In a couple of places I eventually found where the wire due to rubbing had a spot where the insulation had worn and was touching the frame etc.
One I found where someone in the past had cut into the wiring for something then later removed it and left a bare end that would short on occassion.
I don't have any specific suggestions and unless you're either good or lucky, it will just take time and perseverence to find it.
Good luck
Torino - turned out to be a bent pin on the harness connector where it went through the firewall.
Couple of others it ended up needing a ohm meter and wiring schematic. Started going through the circuit and at each connector, disconnected it and checked each section whether it was grounding or not. Very slow and time consuming but didn't have many other choices. In a couple of places I eventually found where the wire due to rubbing had a spot where the insulation had worn and was touching the frame etc.
One I found where someone in the past had cut into the wiring for something then later removed it and left a bare end that would short on occassion.
I don't have any specific suggestions and unless you're either good or lucky, it will just take time and perseverence to find it.
Good luck
#15
Look for critter damage, also. The last one I had to fix in my fleet was due to a mouse nest next to a harness and the little critters chewed a bunch of the insulation off the wires
Here's a tip for folks needing help: ALWAYS IDENTIFY YOUR VEHICLE, THE FUSE NUMBER IN QUESTION, AND THE SYMPTOMS UNDER WHICH THE FUSE BLOWS. With that information, an experienced technician can get you focused on the right are to look at instead of pi$$ing away time and money on wild goose chases.
Here's a tip for folks needing help: ALWAYS IDENTIFY YOUR VEHICLE, THE FUSE NUMBER IN QUESTION, AND THE SYMPTOMS UNDER WHICH THE FUSE BLOWS. With that information, an experienced technician can get you focused on the right are to look at instead of pi$$ing away time and money on wild goose chases.