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Old Aug 27, 2007 | 05:24 PM
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horn dont work

I got into a little fender bender and my horn doesnt work in my 93 f150. How can I test the horn or the wiring?
 
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Old Aug 27, 2007 | 07:42 PM
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If you can find it(they are hard to get to sometimes), you can run jumper wire from the battery + to the horn terminal and see if it will work.
 
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Old Aug 28, 2007 | 05:24 PM
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Just an update. Both horns slightly beeped. more like burped, when I hooked them to the battery. Also the fuse is good. Should I hook up my meter to the ends of the plugs to see if I get voltage?
 
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Old Aug 28, 2007 | 06:23 PM
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If you used a decent sized wire(at least 16 gauge) they should have worked. You may want to check the ground to the front sheetmetal, but other than that, the horns don't look good. You could also take them off and put them on the battery itself and see what they do.
 
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Old Aug 28, 2007 | 07:29 PM
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Yea the wire was very small thats probally why. But they did sound off and they dont do anything when the horn is pressed. Can I check the wires and should I see any current?
 
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Old Aug 29, 2007 | 12:10 AM
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I don't have a diagram for a 93, but most of the time they used a horn relay. Look around under the hood and see if you can find a bank of relays. There should be one for the computer, one for the fuel pump and there may be one for the horn. It should be clicking when you push the horn button.
 
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Old Aug 29, 2007 | 05:25 AM
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I dont hear anything when I press the horn.
 
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Old Aug 29, 2007 | 04:10 PM
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Here's a thread where the horn relay is located under the dash. I don't know if yours is there or not. They sure did move things around through the years.

https://www.ford-trucks.com/forums/6...f150-horn.html
 
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Old Aug 29, 2007 | 06:54 PM
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Ill check that. I gotta get this thing fixed cause inspection is coming up soon. BTW, the horns do work.
 
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Old Aug 31, 2007 | 05:33 PM
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NOpe, no realy. I sawe a gray plug under there with a cap on it though. Took the cap off and it looks like a serial port of some kind.
 
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Old Sep 2, 2007 | 12:14 PM
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Relay is fine. I put one of the other ones in it and still no clicking. Could it be the metal wheel in the steering shaft with the spring on it? Not sure what it does but theres nothing touching the wheel with all the holes in it.
 
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Old Sep 2, 2007 | 02:25 PM
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They did things different in the steering wheel, depending on the year, but see if you can find the horn wire in the steering wheel. Some years they used a brush that rubs on a contact ring, and others they used what they call a clockspring.

If you can find the wire, touch it to a metal part of the column, and see if the horn works. If that doesn't work, then get a scrap piece of wire and touch it to the horn wire, and then touch the other end to a good ground somewhere on the truck. Grounding the horn wire should make the relay click, and the horns blow.
 
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Old Sep 3, 2007 | 05:31 AM
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I've got the same truck and had the same problem right when I needed an inspection. Pulling the horns out and cleaning the rust off of the mounting plate with a wire wheel and using a wire brush to clean the rust off of the mounting surface on the truck reestablished the ground if I remember right.

The relay is in the engine compartment fuse box. 3rd one in. I would bet it's the ground though. Have you pulled the horns out yet?
 
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Old Sep 3, 2007 | 02:26 PM
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Yes I pulled the horns out and touched them to the battery and nothing happened. Thats when I figued that they must be grounded when their mounted so I reattached them and ran the wire to them from the battery and they blew just fine which makes me think its something else. The realy is NOT clicking at all so it has to be something between the horn pad and the relay right? Like I said, I took the round metal thing out with the spring thats near the steering knuckle and cant really see what it does.
 
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Old Sep 3, 2007 | 02:54 PM
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if you are working on the 93 you have in your profile, it sounds like the clock-spring mechanism is bad.
it is behind the steering wheel. does your airbag light blink, and does your cruise control work??
normally the first thing to go is the cruise, followed by the airbag circuit, and the horn last. but i have seen them drop the horn first on 2 vehicles.
 
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