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Old 06-19-2020, 04:26 PM   #15
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Would an electrical sell annoyed shut off switch work if it was jammed in the on position?
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Old 06-19-2020, 04:41 PM   #16
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Would an electrical sell annoyed shut off switch work if it was jammed in the on position?


No, it would not. This thread made it clear to me that two things are needed to address two separate potential problems; 1) an ON/OFF switch to protect against either inadvertent blasting of the horn or a stuck horn button/contact and 2) a manual inline shutoff valve on the air line going to the horns in the event of a mechanically stuck solenoid.

I’ve already added the ON/OFF switch but now plan to add a simple ball valve to the air line between the solenoid and the horns. Super easy thing to do. I have to confirm, but I think the line is 1/4” ID.
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Old 06-19-2020, 04:58 PM   #17
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That is solenoid. I was using voice dictation.
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Old 06-19-2020, 08:24 PM   #18
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Rsponsford is right, a simple ball valve will eliminate the air flow to the horn. It is a 1/4” fitting and I will be installing all the new parts (new 12VDC solenoid and manual air shut off valve) on Sunday.
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Old 06-22-2020, 12:11 PM   #19
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I am having the exact same issue. Left on a trip last Tuesday and once the air system filled the horn stated blowing. I crawled under and tapped on the horn with a wrench, and it quit blowing. So, does anyone know if there is some, additional solenoid in the horn itself or could my tapping have put some sort of back pressure on the air line to have unstuck the main solenoid in the DS front compartment?
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Old 06-22-2020, 03:48 PM   #20
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I located the failed part in the bay beneath the drivers seat. Now I just need to find the replacement part. Attachment 289728


I managed to put the new solenoid and manual shut off valve in the coach today. All tested and working. Now all that is left is a sign indicating what the valve is for. Click image for larger version

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Old 06-22-2020, 03:50 PM   #21
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I am having the exact same issue. Left on a trip last Tuesday and once the air system filled the horn stated blowing. I crawled under and tapped on the horn with a wrench, and it quit blowing. So, does anyone know if there is some, additional solenoid in the horn itself or could my tapping have put some sort of back pressure on the air line to have unstuck the main solenoid in the DS front compartment?


I did read on my chassis air schematics the air horns do have a solenoid in them. What I couldn’t understand was with no wiring going to the horns how possibly could it work?
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Old 06-22-2020, 10:54 PM   #22
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Some air horns have a solenoid attached to the horn they would have the air and electrical run too the horn. I believe all cc motor homes have the horns on the roof and the solenoid located remotely under the coach or in the front area in which case the electric And air is routed to the solenoid and air only run to the roof horns from the solenoid
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Old 06-23-2020, 07:52 AM   #23
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And some air horns work off of the Smart Wheel
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Old 06-29-2020, 10:55 PM   #24
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I was finally able to install a new solenoid this evening and that solved my issue. Apparently the old one was stuck partially open and when I tapped on the horn itself it was causing the diaphragm to close off the air flow. But after installation all is working as originally intended. Thank you all for your help.
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Old 06-29-2020, 11:22 PM   #25
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I was finally able to install a new solenoid this evening and that solved my issue. Apparently the old one was stuck partially open and when I tapped on the horn itself it was causing the diaphragm to close off the air flow. But after installation all is working as originally intended. Thank you all for your help.
Thank you for the confirmation follow up. Too often we don't hear back.


Many happy and safe miles for you!
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Old 06-30-2020, 05:58 AM   #26
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I suggest that you exercise your air horns on each trip. Just to make sure they will work when needed and to perhaps clear the valve seat on the solenoid or tell you there are insect deposits in the horns.
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Old 06-30-2020, 06:11 PM   #27
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I suggest that you exercise your air horns on each trip. Just to make sure they will work when needed and to perhaps clear the valve seat on the solenoid or tell you there are insect deposits in the horns.
That's kinda been my approach over the years, but this thread has me nervous about that, as I can't imagine trying to get pulled in somewhere with the horns blowing while I try to figure out how to get them disconnected. I like the manual shutoff valve option, just not sure it fits in the priority list. All told, I think the periodic exercise option is still the best plan. Plus, the kids still seem to get a laugh out of them when there's nothing else in sight.
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