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Old 10-14-2012, 09:29 AM   #1
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Dual Electric Roof Horns

Horns are extremly weak and are almost not sounding at all. There is a screw on the back of each horn, what does that do???
Does anyone have a schematic or diagram of a typical roof horn set up.
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Old 10-14-2012, 10:56 AM   #2
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The tone screw on the horn can be used to vary the sound of the horn , but will not change the volume. Exposed electric horns can rust internaly, so you may be looking at replacement.
Have you tested, power and ground, at the horn ?
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Old 10-14-2012, 03:39 PM   #3
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The tone screw on the horn can be used to vary the sound of the horn , but will not change the volume. Exposed electric horns can rust internaly, so you may be looking at replacement.
Have you tested, power and ground, at the horn ?
The wires at each horn go into a big gob of sealer at the roof and I have no access from inside, I located the horn relay and it just clicks when I hit the horn ring.
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Old 10-14-2012, 04:40 PM   #4
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Could be weak voltage..
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Old 10-14-2012, 07:33 PM   #5
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Could be weak voltage..
12.5 volts at the relay, probably a bad ground somewhere along the line
I plan to cut apart that glob of sealer and see what the horn wires splice into.
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Old 10-15-2012, 07:55 PM   #6
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12.5 volts at the relay, probably a bad ground somewhere along the line
I plan to cut apart that glob of sealer and see what the horn wires splice into.
It is so hard to trace wires on an old rv, I found 18 ga wires coming from the horn spliced into 14 ga wire of a diff color sliced into another 14 ga wire of another color again. I found I have two horn relays, one I think is for the roof electric horns and another is for the air driven plastic 3 horn set behind the grill
They just used whatever wire they had laying around and used many of those folding crimp together wire splice things that punch holes in wires.
no horns yet but I will eventually get to the bottom of the mystery
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Old 11-05-2012, 06:01 PM   #7
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Dual horns

If your horns make any noise quit chasing wires. Inside the horns they get clogged with bugs and even mice nest inside of them over the winter. But what probably happen is over time the inside parts that move to make sound corrode and can't move well or don't move. Twin chrome boat horns on eBay are $65 from the marine supply store.........how do I know all this......I just spent the $65 and now have two chrome trumpets that I test everyday just because it bothers my neighbors.....this is the fun ya have when retired
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Old 12-11-2012, 10:46 PM   #8
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I have a pair of Electric Airhorns on the roof of my Airstream that would not work...
I stripped and cleaned them with no joy so far, but maybe the following might help you..

Here are mine...


Full of junk...

Removed the trumpets.

Drilled out the rivets..


Front side looked ok..


But the back was ugly...


Despite my efforts niether will work better than this video.


I found a lot of good info here which might help you...

Horn Repair

How to Restore a Classic Car Horn
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