What is the problem? It needs to be identified before we can tell you what is needed
February, 12, 2013 AT 1:20 AM
That's not a simple question. You haven't listed what the symptom is, what diagnostics you have done, what the cause of the problem is, or what it will take to fix it. When this circuit was designed with common sense, the horn switch on the steering wheel turned on the five-dollar horn relay which turned on the pair of horns. That was much too simple and reliable. On your vehicle the insane engineers saw fit to make the horn switch send a voltage to the most complicated computer module, the instrument cluster. It interprets that signal and sends a digital computer signal on the data buss to the "FEM", the Front Electronic Module, another computer, which interprets that signal as the "horn request". It turns on the relay to blow the horn. Two computers involved in blowing the horn. You can check the fuses first, but the typical repair bill on a Ford for a dead horn, after lots of diagnostics, is $800.00.
February, 12, 2013 AT 1:45 AM
TOOLS NEEDED TO REPLACE THIS HORN 2003 EXCURSION THE FUSES ARE STILL GOOD?
February, 12, 2013 AT 2:34 AM
Have you actually looked at the horn to see what kind of fasteners are holding them on? You're the one by the vehicle. We can't see it over a computer. No mechanic has ever asked someone else to come over to the vehicle to ask what tool is needed. They look at it and try different size wrenches or sockets until they find the one that fits.
You also have to consider there are two horns; a high note and a low note. You didn't bother to say what the symptom or problem is so let me explain that if there is no sound at all, both horns did not fail at the same time so replacing one won't solve the problem. The exception is if one of them is shorted, but that would cause a fuse to blow, and you said no fuses were blown.