See video below. Any ideas? It's a brand new horn, grounds and wiring look good:

 

 

Is there a horn relay? Is the horn properly grounded to the truck? Also check your rag joint for continuity or resistance, from the steering column side to the steering box side.
If it loses contact there, you'll lose your horn, but I suppose a really bad connection could cause what you're hearing. Try hooking the horn straight to the battery to rule out defective new products.

 

 

It does rumble pretty sweet don't it?

 

Yea, try connecting straight to battery power as suggested.

 

That's a good test, because it rules out (or confirms) that the horn itself is bad. Which is what it sounds like to me.
An electrical problem would more often leave you with a less robust sound than normal, but it would still sound like it's a horn trying to honk. Yours sounds like on old tired horn that's gotten a lot of water and junk inside it over the years.

If the direct connection does not result in any change, remove the horn, smack it lightly a couple of times (not hard, but enough to help dislodge stuff) and then turn the adjusting screw in and out slightly to release the diaphragm inside.
This will often "fix" the horn enough to get it working for a few more years.

As for a voltage problem, there are a couple of things that happen that you can fix for awhile. One of which even turns into regular maintenance if you don't have relays.
And speaking of relays, your truck may or may not have them. If it's a tilt column without cruise control but you have A/C, you probably don't have a relay. If not, DEFINITELY ADD ONE! It's easy and well worth a little time and money.

The non-relay setups have way too long of a wire path for the power to flow through, and the horn contacts in the steering wheel/turn signal switch get carbon scored and worn out. You can file them smooth and clean, then add electric grease (or even dilectric grease in this case I'm pretty sure) to help them last longer next time. But adding the relay reduces the current passing through the contacts under the steering wheel by probably 97% or more. Big score there for reliability of the more expensive part. Easier and cheaper to replace a worn out relay down the road than to remove the turn signal switch.

So no matter if it turns out to be the horn or not, verify you have a horn relay from Ford. If not, add your own.
If you're not sure how that's done (it's easy peasy) ask away and we can walk you through it.

Good luck. Let us know if it responds to any of the love.

Paul

 

sounds like its farting.

 

horns typoically have adjusting screws. Look for a screw with a locknut at its base, loosen the locknut, then adjust the screw until your horn works as you want it to. If it can't be adjusted, return it. It is getting juice and should work.