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Old 09-06-2021, 03:38 PM
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Default Horn or Horns?

Recently picked up a very originall 67 GTO. Did the 67 GTO come with dual horns? Mine has just one and its not working.

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Old 09-06-2021, 04:23 PM
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Dual Horns were standard on all models except Tempest.
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Old 09-06-2021, 05:19 PM
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I like air horns particularly for low cars.

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Old 10-01-2021, 01:06 PM
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After investigating mine were not plugged in. Still not working maybe replace relay next.

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Old 10-01-2021, 04:14 PM
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Quote:
Originally Posted by pmdclassics View Post
After investigating mine were not plugged in. Still not working maybe replace relay next.
Unplug the hot wire at the horn and use a jumper from the battery to see if the horn works.

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Old 10-07-2021, 02:46 AM
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I definitely wouldn't replace the relay without testing the horns or the voltage to them...90% of the time it's the horns themselves. They can be repaired fairly easily by the way.

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Old 10-07-2021, 11:52 AM
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Quote:
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They can be repaired fairly easily by the way.
Greg, any chance you know of any resources/info for repairing the horns? My low-tone horn works but is buzzy. I've heard reference of a bolt that allows you to adjust the diaphragm, but I'm not sure if this is true. I'm assuming my diaphragm is rusted out.

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Old 10-07-2021, 12:26 PM
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There is a screw on the back of every electric horn I know. Just grabbed this one at random
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Old 10-07-2021, 12:32 PM
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The Horn Works in Wisconsin. He has restored two sets of horns for me.

https://www.carhornrestoration.com/index.html
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Old 10-07-2021, 12:38 PM
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Quote:
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There is a screw on the back of every electric horn I know. Just grabbed this one at random
Thanks. I see that on my horns. Wasn't sure what it was. I'll give it a try.

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The Horn Works in Wisconsin. He has restored two sets of horns for me.



https://www.carhornrestoration.com/index.html
Thanks. I'm more interested in a guide for repairing them myself and a place to buy parts rather than paying someone else.

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Old 10-07-2021, 03:56 PM
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Yes, there is a tutorial online somewhere. I'll have to try to remember where I saw it but it's basically drilling the rivets out, separating the halves and thoroughly cleaning everything inside. It won't look totally factory but it will look pretty good when you put nylon insert lock nuts and screws on it and paint everything.
You tune that screw using an amp meter in series.... But it's no good if the contact inside is all corroded. I'm sure I can find it but I'm posting this on my phone and I believe I have the information on my laptop.
The way they work is this.. there is a sheet metal diaphragm similar to a speaker cone with an electrical contact on it. There is a coil of wire near the cone.. when the horn relay applies voltage, the coil induces a magnetic field which pulls the cone and opens the contact. When the contact opens, the cone relaxes again and immediately makes contact again. This repeats at a high frequency over and over again causing a buzzing made by the sheet metal cone. The horn shape amplifies it. The adjustment screw allows you to tweak the mechanical movement of the cone to a sweet spot indicated by peaking the current draw.
If you drill the rivets out and take it apart you'll see how it works.

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Last edited by Greg Reid; 10-07-2021 at 04:55 PM.
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Old 10-07-2021, 05:09 PM
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I found a short thread from back when I did mine. I was wrong about peakng the current totally. There is a sweet spot though.. you basically only peak it to the point where the volume/sound starts degrading, then back off a little.

https://forums.maxperformanceinc.com...highlight=Horn

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Old 10-07-2021, 08:24 PM
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Thanks Greg. Did you have to replace the diaphragm in your horns?

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Old 10-07-2021, 08:36 PM
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Quote:
Originally Posted by padgett View Post
I like air horns particularly for low cars.
Irrelevant to the question. Pontiac doesn't have air horns.

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Old 10-07-2021, 10:29 PM
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The information on a Window Sticker mentions “HORNS-DUAL” as standard equipment on a GTO.
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Old 10-08-2021, 03:30 AM
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Quote:
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Thanks Greg. Did you have to replace the diaphragm in your horns?
No, l didn't have to replace anything except the rivet. Just clean the contact and all of the crud that winds up in them over time. Dirt, spiderwebs dead bugs, etc. It just needs to be able to move freely when it's exposed to the magnetic field.

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Old 10-08-2021, 09:51 AM
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I have seen an online guide to restoring the horns. I think it was on a corvette site…they also had a source for rivets to put it back together as I recall.

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Old 10-08-2021, 01:57 PM
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I found an article that will suffice although it's not the exact article I used back then..He doesn't go into any detail about removing the rivets but I now recall that the ones in our horns are pretty heavy and swaged in place. I used a Dremel to grind the heads off IlRC...
http://www.secondchancegarage.com/public/198.cfm
This reminded me also that I forgot to mention that there is a gasket between the two covers. I used rtv and this guy and the original article that I used did the same.

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Last edited by Greg Reid; 10-08-2021 at 02:03 PM.
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