Ford Super Duty (1999-2016) :: 2003 F450 - Horn Not Working / Relay Location
May 19, 2017
Attempting to debug the Horn not working on my 2003 Ford F450, The fuse is good (shown as #37 15 amps) so next I would like to check the Horn relay.
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Where I can locate rear fender flares that will match 2011 and up f450 flares? Which flares would cover the f450 front fender flares holes?
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2004 super duty crew long bed 2wd, v10 auto SLT.
Manual says not in fuse block.
Looked behind radio, nothing, not even a space or the blue one there.
There are some on the firewall, driver side not marked. No pink wire.
Where else??
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Can't find my manual and getting ready to haul camper in an hour...no trailer parking lamp power on truckside plug. No blown fuse but heard there may be a relay.
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I am looking for the location of the fuel pump relay for my 1999 Ford F550 V10 4WD Gas truck.
I have replaced the fuel filter and fuel pump. When the key is turned the pump gets juice and 2 seconds later is not getting juice. No lines are coming into it, so it's not getting up to pressure and shutting off.
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I am trying to diagnose my fuel system, but I cant seem to find the fuel pump relay. My truck is an 2004 f250 crew cab work truck with 5.4L. it seems that the relay can be mounted anywhere from behind the radio or in the engine compartment as well as built in to the fuse box under the steering wheel.
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The #8 fuse under the hood was blowing on my '00 F-250 every time I turned on the healights meaning I would lose power to my park lights. The brown wire coming from the back of the headlight switch showed a dead short to ground that I traced to somewhere between the switch and the firewall.
Anyway, I got tired of trying to pinpoint the ground fault, so I cut the brown wires at the back of the switch and under the hood at the top bolt-on electrical plug and replaced the bad section with a new wire. It works fine now with the only exception being I do not get the park light flash when I hit the remote lock button the second time. I do still get the horn chirp.
My Haynes manual indicates there should be a relay box with a Park Lamp relay, Driver Unlock relay, All Lock Relay, and All Unlock relay. The park light relay looks like it sends the blip of power to the park light circuit. Where this relay box is? I'd like to splice into the brown wir coming out of it to restore the light flash when I lock the truck since sometimes it's too noisy to hear the horn.
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Looking for where the fuel pump relay is 2001 f 250 SD reg cab 2 wd. Won't Start On pump gas , starting fluid yes
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My horn isn't working. The under-dash fuse is OK and was going to check the horn relay, but can't figure out which one it is despite numerous FTE and Google searches. I pulled the cover on 2 power distribution boxes under the hood, driver's side. One box has 2 relays. The other has 4. Which one controls the horn?
Then...how do I test it to see if it's good/bad?
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Its it true, that the fuel pump relay is hid in the fuse and relay box, and non serviceable ?
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2001 F450/6.8. The trim ring is missing on the shift lever switch and the switch doesn't seem to light up or take the truck out of overdrive when pressed. Truck shifts just fine in all other aspects. Fuses all appear to be good.
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I have a 7.3l 02 f450. The wipers won't work on any low speeds and only on the fastest will they work. And if you switch it from the fastest to any other speeds, the wipers stop right where they are.
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Im working on a 03 f-450 that has a front end vibration, it starts when you hit 25 mph and its a humming / vibration that seems more to the passenger side than the drivers side. You can also hear it decrease when you come down in speed and it dissappears below 25 mph. Its a 2003 F-450 CC 4x4 DRW with the v-10.
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I have a 2001 F-250 SD XLT with the ABS light on, cruise control doesnt work and the horn only works with the key out. The codes for the ABS is no signal input from the left and right front wheel sensors. No problem there. Also my speedo stops or jumps when I press the horn button while driving down the road. When I quit pressing the horn button the speedo works fine. So after looking over the posts on cruise control, etc. Does the rear speed sensor have anything to do with the cruise, horn not working? All fuses are good so I am thinking the cruise control switch on the master cylinder or a short in the steering wheel column or my ignition switch. What do you all think?
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I am trying to figure out where the relay would be when i look online for the map of the relay box under the hood it says nothing of a horn relay. I don't have a key fob for the doors to unlock so I wouldn't think its tied to the computer. Should mention nothing happens when you hit the horn also fuse is fine. No power at the actual horn when i hit the steering wheel(horn)....
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I have a 2003 F450 PSD which won't start cold. I leave it plugged in overnight and it won't start in the morning without starting fluid. I spray a little while cranking and it turns right over. It runs really rough for a few minutes but as it gets hotter it settles down and runs like it's brand new.
Once at operating temp it will start up again no problem. I changed the GPs, the GPR, the valve cover gaskets and GP harnesses, 2 brand new batteries, oil change, fuel filter, air filter. I can't imagine what the problem can be.
I know the icp sensor is bad, I checked it and it has oil in it, but it still won't start unplugged so that isn't the main problem. I noticed it has a minor oil leak, not sure of where it's coming from, but it seems to leak when the truck settles.
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I have a 2001 for f250 with the electronic shift on the fly and when I turn the switch to put it in 4hi or low nothing happens I don't hear a click and the lights don't come on but the 4wd light works it comes on when I first start the truck and I put different relays in that we're good and still nothing I tested the the relay box itself for power and there wasn't any.
I used the truck last year for plowing and it worked sometimes it wouldn't go In or come out but after a few tries it would end up working but I've tried everything I could think of I'm starting to think it's something electrical because the relay box isn't getting power to it but idk if a vacuum leak would do that or a bad transfer case motor or iwe solenoid or if it's something more like a broken wire some where.
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I have a 2003 Ford F450 super duty xl. At first there was a loud clicking sound coming from under my dash. I charged the battery up and the sound went away but the truck will fire up but not turn over and start. I thought maybe it could be the relays but the clicking sound quit.
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I have searched everywhere for the location of the blinker relay on my 02 F-250 7.3 and getting mixed results and still not found.
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I was driving my truck and my power windows quite working I figured it was a fuse so I wasn't to excited about it I stopped and unloaded some scrap metal and then when I started my truck back up I couldn't shift it out of park unless I unplugged the brake pedal sensor or turned the key just out of the off position then shifted to neutral then started then I could put it in gear and go so I got home and started looking checked all my fuses all good then I realize the windshield wipers are not working either and the door beeper, if you have your keys in the ignition also isn't working the horn, isn't working the lights on the window and lock switches isn't working either so I'm kinda lost now gonna barrow a relay tester in the am but I'm kinda thinking maybe the computer ?? For all this to happen at one to,e doesn't make any sense to me that's a lot to all go in one shot it makes more sense to me
No horn
No power windows
No accessory lights on the window and lock switches
No wipers
No buzzer/beeper (like when you open the door and leave the keys in the ignition
Won't shift out of park without doing it with the engine off or the brake pedal position sensor unplugged
I've gone thru with a test light and got power to the fuses for everything but still nothing
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Its and 09, I can hear a relay click under the dash. It has gotten really hot since i bought it in sept to the point where I had to turn it off because I thought it was going to burn my bottom. I am guessing its not an easy fix.
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