HELP! Blowing ignition switch fuse
Thread Starter
|
Junior User
Joined: Mar 2002
Posts: 56
Likes: 0
From: Detroit area
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.
Thread Starter
|
Junior User
Joined: Mar 2002
Posts: 56
Likes: 0
From: Detroit area
Alright, the short is not from the old satellite radio wiring. Anyone have a wiring diagram of what is on the ignition switch fuse circuit? Is there a common problem on this circuit? I hate tracking down electrical problems! Thanks guys!
Laughing Gas
Joined: Dec 2009
Posts: 799
Likes: 13
From: East L.A.
I had a similar condition on an older truck. It turned out a wire was rubbing against a bracket in the engine compartment and was shorting and blowing a fuse which caused the engine to die. I'm not an electronics expert though...
Thread Starter
|
Junior User
Joined: Mar 2002
Posts: 56
Likes: 0
From: Detroit area
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
Thread Starter
|
Junior User
Joined: Mar 2002
Posts: 56
Likes: 0
From: Detroit area
Not yet, I'm suspecting that it may be the fusebox. I've seen a couple threads and a TSB that talks about water getting into the fusebox from one of two sources. The AC drain valve, or the third brake light. Apparently water will follow along the wiring back to the fusebox.
Trending Topics
Super Moderator
Joined: May 2004
Posts: 29,380
Likes: 118
From: Central Coast of CA
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
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
Super Moderator
Joined: May 2004
Posts: 29,380
Likes: 118
From: Central Coast of CA
Stewart
Thread Starter
|
Junior User
Joined: Mar 2002
Posts: 56
Likes: 0
From: Detroit area
It does drive me nuts, but unfortunately I have to prioritize in my budget. I can only try replacing so many things with the extra money that comes through. Hopefully within the next month or two I'll but a new fusebox.
New User
Joined: Apr 2010
Posts: 5
Likes: 0
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
Senior User
Joined: Jul 2009
Posts: 379
Likes: 0
From: Minneapolis, Mn
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
Hotshot
Joined: Jan 2004
Posts: 19,762
Likes: 1,079
From: St Louis
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.