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Old 08-16-2011, 09:21 AM   #1
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Mystery of the air horn

I have a 2006 Discovery 39V, purchased new in 2006. On the first night in the coach, the air horn went on--- at 2 AM of course! Noise stopped by itself after maybe 10 seconds, though it seemed much longer. Never happened again for four years and then happened one time ( at night of course). Nothing for another whole year, and then it happened again. This coach does not have a switch for air horn off/on and this is confirmed by Freightliner and Fleetwood. I went under the dashboard to open the fuse box and pull the air horn fuse so this would not happen again. In just touching the plastic cover of the fuse box, the horn went on again! I am working on getting this taken care of, though no one has ever heard of this happening or what to do. Seems at this point that it might be a short somewhere because of the horn going on when I touched the box.

Two questions: any thoughts of what might be going on here? Why would a short in the system cause this to happen so intermittently? Also, if there is no switch to turn off the air horn, what horn sounds when I touch the spot on the steering wheel to engage a horn?

Someone else must have this kind of horn configuration in their Fleetwood too.

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Old 08-16-2011, 10:42 AM   #2
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if there is no switch to turn off the air horn, what horn sounds when I touch the spot on the steering wheel to engage a horn?
You D has only one horn installed. So the spot on the steering wheel turns on the one that goes off by itself once in a while.
99 Discovery 34Q ISB
2014 MKS AWD EcoBoost Toad
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