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Old 01-10-2015, 06:58 PM   #1
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Air Horns stopped working

My air horns stopped working when I press the steering wheel horn recently though they worked fine a week ago. I located some brochure on the air horns that came with my MH and they indicate that there should be a separate air compressor and air tank for the system and that the horn button simple activates a solenoid near by the air tank that release air into the horns. Any ideas as to where I would find the air tank, air compressor or solenoid for the air horns? I've looked closely in the front basement compartment underneath the drivers chair area with no luck. I've also searched under the front corners of the coach and don't see them anywhere.

Is it possible the air horns run off my coach air systems? My owners manuals and related diagrams don't show any air horn systems other then one wiring diagram indicating that the horn button wire is #57.

Thanks for any help you can give me.
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Old 01-10-2015, 08:06 PM   #2
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If this is a DP, I would say that there's a good chance the air horns run off the coach's air supply.

Generally the solenoid is under the hood.

A lot of times there is a dash switch to allow switching from "city" horns to "highway" horns.

This reminds me of the time I prepared myself for battle with the air horn system on ours that had quit out of the clear blue like you describe. I located the relay, lines, solenoid, etc, and was in the process of checking out the city/highway switch after removing it from the back side of the dashboard. With no joy there, it occurred to me I might check the horn fuse? Sure enough.....
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Old 01-10-2015, 08:25 PM   #3
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Air tanks are underneath the MH so they can bleed moisture and oil when needed.
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Old 01-11-2015, 07:35 AM   #4
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Kind of suprising that a DP would have separate air supply for the air horns when it already has its own onboard air system. However, they do make air horns that have their own built-in compressor, powered by 12v electric. They are typically used on coaches without an air system, e.g. gas-engine coaches with hydraulic brake systems. Maybe CC used that kind of system on your coach to avoid running air lines to the horn location, e.g. up on the roof.

In either case, the horn button activates a solenoid to toot the horn. That solenoid either opens an air valve (on-board air system) or powers the horns own mini-compressor that spins up and blows the horn. Chances are that either the solenoid has quit or the fuse for 12v power has blown.
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Old 01-11-2015, 07:54 AM   #5
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Tim, obviously my Allure may be set up differently but take another look in the bay under the driver's window. There should be a couple of fuse boxes with labels. I think there is a horn fuse that you can check.

My horns run off the coach air supply. The solenoid that sends air to the horns is mounted in that bay near the lower front wall. It has a 1/4" yellow nylon air line coming out of the top. If the relay has gotten some crud in it, you might give it a tap with a tool to see if that frees it up.

One of my horns quit working. I called Hadley and they said to remove the back of the horn, clean the thin metal diaphragm and reinstall. It cured my problem. Probably not your issue if both horns have quit.

Let us know what you find.
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Old 01-11-2015, 07:56 AM   #6
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Mine went a couple months ago-- ordered and installed a new Solenoid
Mine is plumbed from one of my 2 air tanks.
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Old 01-11-2015, 09:18 AM   #7
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Are you now in freezing temperatures? Compressed air will have moisture in it that could freeze and block the pipes.
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Old 01-11-2015, 05:15 PM   #8
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If you can find a air solenoid somewhere up front, have DW press the horn switch and you give that little bugger a good rap with a stout hammer. Might work, might not..
Good luck
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Old 01-11-2015, 06:22 PM   #9
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I thought on my 98 Magna there was a seperate small compressor right in front of the generator battery?
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Old 01-11-2015, 09:29 PM   #10
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Okay, thanks to all of you. I'll try to I.D. both the fuse location -- and check it as well as the solenoid location--and give her a god rap.
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Old 01-11-2015, 10:13 PM   #11
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Tim.....Do you ever set things on the steering wheel when parked. Many like to tilt the wheel up and use it as a table. This will sometimes depress the horn (which will not sound when the air is dumped) and will often blow a fuse.
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