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Author Topic: Horn Stopped Working  (Read 2727 times)

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Chris_H

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Re: Horn Stopped Working
« Reply #15 on: 18 March 2009, 09:35:35 »

Quote
...WNBC adds more unknows...
There are times when it's the only way you are going to solve the problem.
Quote
...and you don't know that the part you are fitting works...
That's a bit extreme.  In the case of the horn, you poke it on the battery as you walk past.

We must agree to disagree methinks. :D
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Re: Horn Stopped Working
« Reply #16 on: 18 March 2009, 10:08:16 »

First time mine packed up leccy plug had fallen off horns!
Second time fuse blown - new fuse horns worked until bolted onto car then fuse blew again.  Replacement horns cured!!
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Chris_H

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Re: Horn Stopped Working
« Reply #17 on: 18 March 2009, 10:39:45 »

Most cheapo electric horns are a like a loudspeaker with a series switch mechanically connected to the diaphragm.  So as the diaphragm moves the switch breaks and power is removed from the coil, so the diaphragm moves back.  The mass and springiness of the mechanism determines the pitch at which it oscillates.

Trouble is, they take a lot of current and the contacts arc.  They can weld up - no sound, blows fuse; but a clout with a hammer (especially when powered via a current-limiting resistor) can free the contacts again.

Sadly the contacts are probably damaged by now so the contact area reduces which aggravates the problem for the future. :-[
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MutantCav

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Re: Horn Stopped Working
« Reply #18 on: 18 March 2009, 22:04:36 »

Right, had a bit of a check today although not a clue how to check the current...but steering wheel stereo controls work fine...fuse is fine...relay clicks when either horn button is pressed which suggests to me its ok? And both horns have their wiring firmly in place...
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Entwood

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Re: Horn Stopped Working
« Reply #19 on: 18 March 2009, 22:08:55 »

Give the horns a firm tap with a small hammer ... it is not unknown tor the moving parts to corrode and sieze if not used for long periods .. a judicious tap - especialliy whilst someone presses the button - can often free the mechanism .. :)

You could also try 12 V directly at the horns with some decent sized wire ...  ???

HTH
« Last Edit: 18 March 2009, 22:10:16 by entwood »
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Andy B

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Re: Horn Stopped Working
« Reply #20 on: 18 March 2009, 22:11:21 »

Quote
Right, had a bit of a check today although not a clue how to check the current...but steering wheel stereo controls work fine...fuse is fine...relay clicks when either horn button is pressed which suggests to me its ok? And both horns have their wiring firmly in place...

Put 12 volt across the terminals of each horn - after you 've roemoved it - to see if it works.
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MutantCav

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Re: Horn Stopped Working
« Reply #21 on: 18 March 2009, 22:11:25 »

How about a firm tap with a big hammer as thats all I have? lol The horn gets used quite regularly (small boy who loves pressing the horn button in Tescos car park) but its quite possible...if not I will swap the horns over with the others and see where we are then  :y
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Andy B

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Re: Horn Stopped Working
« Reply #22 on: 18 March 2009, 22:12:46 »

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How about a firm tap with a big hammer as thats all I have? lol The horn gets used quite regularly (small boy who loves pressing the horn button in Tescos car park) but its quite possible...if not I will swap the horns over with the others and see where we are then  :y
Do you realise they're both a different frequency ..... 500Hz & 400Hz
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MutantCav

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Re: Horn Stopped Working
« Reply #23 on: 18 March 2009, 22:19:45 »

Didnt realise the 2 horns were individually controlled by the 2 buttons, or that they were a different frequency no...now I HAVE to get them working to check it out! lol
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Entwood

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Re: Horn Stopped Working
« Reply #24 on: 18 March 2009, 22:24:35 »

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Didnt realise the 2 horns were individually controlled by the 2 buttons, or that they were a different frequency no...now I HAVE to get them working to check it out! lol

They are NOT ... both horns sound at the same time if either button pressed, just look at the connector !!!,  the 2 frequencies just give that nice "blare" sound .. :)
« Last Edit: 18 March 2009, 22:25:20 by entwood »
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Andy B

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Re: Horn Stopped Working
« Reply #25 on: 18 March 2009, 22:28:43 »

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Didnt realise the 2 horns were individually controlled by the 2 buttons, or that they were a different frequency no...now I HAVE to get them working to check it out! lol

 :-? What Entwood says. They're called 'twin tone' horns.
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MutantCav

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Re: Horn Stopped Working
« Reply #26 on: 18 March 2009, 22:30:57 »

I wonder if you can hook them up to play tunes! lol Personally I would prefer it to have a great big artic sounding BLARE
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000jonboy

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Re: Horn Stopped Working
« Reply #27 on: 18 March 2009, 22:43:49 »

have you checked wiring from horns as i had a mate with same problem and it turned out to be wiring had been rubbing and had caused fault  ;)
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Andy B

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Re: Horn Stopped Working
« Reply #28 on: 18 March 2009, 22:52:11 »

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have you checked wiring from horns as i had a mate with same problem and it turned out to be wiring had been rubbing and had caused fault  ;)

Which was the reason for one of mine failing some time ago.
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MutantCav

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Re: Horn Stopped Working
« Reply #29 on: 25 March 2009, 12:46:00 »

Swapped over the horns (and the SAI pump as it was whining) and horn is back...defo the horns as I swapped the horns with the new one...works...plugged it back into old ones no horn...back to new and horn works again! :) Cheers for all your help guys :y
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