Georgetown Factory Horn Not Working

[George-B]

The factory(Ford) horn on our 2007 Georgetown SE 315 with the F53 chassis stopped working. I replaced the relay under the hood and the 20 AMP fuse. I removed the power plug to the horn and pressed the horn and with a gauge on the cable and there was no power going to the horn. I removed the horn from the steering wheel and connected the two pins in the steering column and still nothing. Is there more than one fuse in the line for the horn?

[Iggy]

Check the ground connections below the horns on the vertical post.
In the past this ground connection has become bad and needs to be cleaned and reattached.
Here are a few pics that others have posted.


The only other things I can think of is to test the horns by taking a positive 12 vdc to the horn terminal pin and test
Good luck

[George-B]

Thank you, will try that this weekend.

[compint]

Has anyone ever replaced their factory horns with something a little more beefier?

[bmurph44]

Originally Posted by compint

Has anyone ever replaced their factory horns with something a little more beefier?

Yes mine has aftermarket air horns installed.

[jgallego]

I also had Dual Hadley's put on mine. I can now compete with a train air horn.

Jaime

[George-B]

Originally Posted by Iggy

Check the ground connections below the horns on the vertical post.
In the past this ground connection has become bad and needs to be cleaned and reattached.
Here are a few pics that others have posted.


The only other things I can think of is to test the horns by taking a positive 12 vdc to the horn terminal pin and test
Good luck

I removed and cleaned the ground connection(shown in the picture). Horn still did not work.
I then removed the horns and tested them with a 12 Volt battery and both horns worked. Reinstalled the horns and they do not work.
Stumped on what to do next other than take the RV to the Ford dealer($130) just to do the diagnostic.

[Iggy]

Now that you tested every part I think you need to check a few things.
1. With ignition on and you press the steering when horn button does the horn relay active. This will pin point if the problem if between the steering wheel and the relay.


2. If you feel the relay pull in and out then you have to work on the power from the relay to the horns.


This is the way I would proceed to see which side of the circuit has failed.


The steering wheel horn button only controls the ground to the horn relay.


Then at the relay contacts close and gives you 12 volt DC positive to the horn wire.
The horn frame mount is the ground.


Good luck.

[Iggy]

Here is a really basic wiring diagram of a horn circuit.

[George-B]

Originally Posted by Iggy

Here is a really basic wiring diagram of a horn circuit.

If I am not mistaken, the horn circuit does not involve the ignition switch as the horn functions even with the ignition off. I could see the circuit you provided be one for an auxiliary horn.
I will be tracing the wiring this week. From an online search I did it appears the horn wire is a 16 gauge Yellow with Lt. Green,

[pmsherman]

I had the opposite problem; my horn sounding off at odd intervals during the night, disturbing nearby campers. The simple solution, getting rid of the cats who ran across the steering wheel, would have also had the DW get rid of me. The solution was an SPST switch installed in the column just below the steering wheel, wired in series with the horn switch. When I arrive at a campground, the switch is turned off and the horn switch is effectively disconnected.

Phil

[George-B]

Originally Posted by Iggy

Now that you tested every part I think you need to check a few things.
1. With ignition on and you press the steering when horn button does the horn relay active. This will pin point if the problem if between the steering wheel and the relay.


2. If you feel the relay pull in and out then you have to work on the power from the relay to the horns.


This is the way I would proceed to see which side of the circuit has failed.


The steering wheel horn button only controls the ground to the horn relay.


Then at the relay contacts close and gives you 12 volt DC positive to the horn wire.
The horn frame mount is the ground.


Good luck.

Iggy,
Thank you for the advice, I wound up taking it to the local Ford dealer.
$550 later, they fixed the two issues causing the problem:
- The horn button(They call it a cover)
- The contact plate in the steering column.

[bmurph44]

Originally Posted by George-B

The factory(Ford) horn on our 2007 Georgetown SE 315 with the F53 chassis stopped working. I replaced the relay under the hood and the 20 AMP fuse. I removed the power plug to the horn and pressed the horn and with a gauge on the cable and there was no power going to the horn. I removed the horn from the steering wheel and connected the two pins in the steering column and still nothing. Is there more than one fuse in the line for the horn?

Where is the 20 amp fuse located?

[George-B]

Originally Posted by bmurph44

Where is the 20 amp fuse located?

The fuse is under the hood. The fuse box is to the left of the Air Filter Box. Very high above the radiator.
The fuse is a large yellow fuse. The horn relay is also in this fuse box.

This is a link to the fuse boxes and which each fuse does.
https://www.fleet.ford.com/truckbbas...f5306mtrhm.pdf