Need help with horn malfunction
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Need help with horn malfunction
My 1999 F-250 Super Duty's horn does not work. The fuse looks good, replaced the relay and it is still not working. Does anyone have a wiring diagram of the horn system and next step suggestions? Thanks for your help.
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Joined: Sep 2011
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From: Mt. Holly Springs, PA
did you check the actual horn?
With a multimeter, or a test light? horns are prety durable but they do break occationally. thats where I would start. also a fuse may look good but i would test it also. Other than that, I may assume that if your asking for a diagram, you are somewhat familure with electrical testing.... So my next suggestion is to test the horn button. Its super easy and virtually the only part of the system that sees any wear due to use so is most likely the part that allways fails. If i were testing my own truck, and i did not have a multimeter i would start by jumping a hot wire from the batt to the horn to make sure it works. if no noise, replace the horn. If it worked, then would go to the horn button. remove the wire from it then ground it on the steering wheel nut. if it works then its the button. if it still no workie... then you need that pesky diagram. this is also asuming the fuse and relay are good also.
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I had the same problem recently on my '08 and it turned out to be the horns themselves. They were just plain dead. My guess is since they're in front of the radiator, they see a lot of moisture and have corroded internally over time. I replaced the horn with an aftermarket one (you do have cut wires to install) and the problem went away. Easiest way to test the horns is to remove them and then jumper 12 volts to it directly to see if it honks.
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Jghake
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
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Aug 31, 2018 07:25 PM
