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4/22/12 3:07pm - Original Message: 'Can't Blow my Horn'
Jeffm Gold Member
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Sebago Lake, ME - USA

Vette(s):
1978 Silver Anniversary L82 4spd (M21) Red Leather. -1978 Pace Car L82 4spd (M21) 20k miles.

Joined: 2/15/2007
Posts: 962
Horn don't work on the '78 Pace car. I took the center cap off the column, took out the 3 screws to remove the thingy with the spacer shims under it and everything appears to be in order. The little pin with the spring on it looks to be in place. Should I be able to short something in there to see if I got power to the horn button? Is there a fuse for the horn or a group it's part of? Wires are hooked to them up under the front. Don't know where to check next??


|UPDATED|4/22/2012 1:07:27 PM (AZT)|/UPDATED|
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4/22/12 4:38pm - Reply: 'Re: Can't Blow my Horn'
rraider1
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Woodland, WA - USA

Vette(s):
1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion

Joined: 10/14/2003
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I would think as you took the horn button off that ring should have sounded the horn. the wire that goes into the steering column is providing the ground for the horn relay. the horn fuse provides power to the relay then to the horns when the relay is energized. i think the horn relay is above fuse panel. if pushing in on the post that rubs on slip ring if you ground that to the column the horn should sound

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Bob R
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4/22/12 7:15pm - Reply: 'Re: Can't Blow my Horn'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

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I'm wid Bob....I don't know how you got the horn cap, and the shim pack off without the horn sounding, or it shocking the crap outta ya! Check the fuses first, of course. That post thingy in the column that the horn rings ride on should have voltage all the time...if it don't, then it is a fuse, or wiring problem. If it DOES, the relay is prolly bad, or a connector somewhere is not making contact. 

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Joel Adams
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4/22/12 8:46pm - Reply: 'Re: Can't Blow my Horn'
Jeffm Gold Member
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Sebago Lake, ME - USA

Vette(s):
1978 Silver Anniversary L82 4spd (M21) Red Leather. -1978 Pace Car L82 4spd (M21) 20k miles.

Joined: 2/15/2007
Posts: 962
Thanks Bob and Joel, I'll climb up under the dash and check out the relay and wiring there. I did poke a thin screwdriver around in the column and got no noise or sparks. 

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4/23/12 6:25pm - Reply: 'Re: Can't Blow my Horn'
BT_Jett
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Woodland Park, CO - USA

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1973 T-Top, Red, 4spd manual, L82

Joined: 2/19/2007
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Just thinkin'  -- did ya try a bigger compressor -- more air?  Big smileBig smileLOL 
 


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4/23/12 8:16pm - Reply: 'Re: Can't Blow my Horn'
Jeffm Gold Member
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Sebago Lake, ME - USA

Vette(s):
1978 Silver Anniversary L82 4spd (M21) Red Leather. -1978 Pace Car L82 4spd (M21) 20k miles.

Joined: 2/15/2007
Posts: 962
BT_Jett said: Just thinkin'  -- did ya try a bigger compressor -- more air?  Big smileBig smileLOL 
 

That reminds me. A friend picked up an old train whistle at a flea market and put a fitting on it for his air compressor. Man, that thing is loud.




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4/23/12 11:15pm - Reply: 'Re: Can't Blow my Horn'
JoeTrecca
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Charlottesville, VA - USA

Vette(s):
1978 Silver Anniversary L82 Previously: 1965 300hp Coupe in 1967. 1967 435hp Coupe in 1968-70. 1969 350hp T-top w/ac and all power options.

Joined: 9/3/2010
Posts: 103
 
Hi Jeff,  The fuse for the horns in the '78 is a 20A labelled STOP/HAZ and it is hot at all times. So if your brake lights work, the fuse should be OK.


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5/4/12 8:16pm - Reply: 'Re: Can't Blow my Horn'
Jeffm Gold Member
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Sebago Lake, ME - USA

Vette(s):
1978 Silver Anniversary L82 4spd (M21) Red Leather. -1978 Pace Car L82 4spd (M21) 20k miles.

Joined: 2/15/2007
Posts: 962
Is the horn relay the little square thing under the dash with a green, orange and black wire? If not, what is that? There's a little copper coil in there and its all cruddy and rusted from water getting in.

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5/4/12 9:44pm - Reply: 'Re: Can't Blow my Horn'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19459



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Joel Adams
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5/5/12 6:04am - Reply: 'Re: Can't Blow my Horn'
Jeffm Gold Member
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Sebago Lake, ME - USA

Vette(s):
1978 Silver Anniversary L82 4spd (M21) Red Leather. -1978 Pace Car L82 4spd (M21) 20k miles.

Joined: 2/15/2007
Posts: 962
Thanks, That sure looks to be the problem.

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5/5/12 10:38am - Reply: 'Re: Can't Blow my Horn'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19459
The orange(or red) is from the fuse box.
The green goes to the horn(s)
Black goes to the horn button, and provides the ground for the relay. If you jumper the green & orange(red) wires(with the relay unplugged), the horn(s) should sound. Assuming, of course, that the fuse is good, and the relay has power to it on the orange(red) wire....and that the horn(s) works.
With it all plugged in, you can ground the black wire, and see if the relay clicks/horn sounds. If it does, your problem is in the black wire from the horn button.
If you have an ohm-meter, you can check the horn button there, also. Black lead to a good ground, red lead to the black wire on the relay connector. There should be no continuity until you press the horn button.
hth


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Joel Adams
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5/5/12 1:21pm - Reply: 'Re: Can't Blow my Horn'
DaveM Lifetime Member
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Flanders, NJ - USA

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1982 Black, ZZ4, Hooker Side Pipes, 3.55 Rear, Rebuilt & upgraded 700R4, All new suspension, brakes, & new Charcoal interior.

Joined: 1/27/2004
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Man Jeff, it really sucks when you can't blow your own horn. Unhappy
Dave


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8/5/12 10:55am - Reply: 'Re: Can't Blow my Horn'
jdgrant Gold Member
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HOT SPRINGS NATIONAL PARK, AR - USA

Vette(s):
1978 (25th Annv. Edition)Red, Black interior, 4-Speed Transmission, L-82, Power & Air, Very Rare Option Package(Only 145 Red 1978s with a 4 speed trans) & Very Original Car, with original Window Sticker, Bill of Sale and all documentaion.

Joined: 11/12/2003
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I just had this problem occur yesterday, but the cause is a question. When I flipped up the tilt wheel on my 78 the horn went off and would not stop until I lowered the tilt wheel to the lowest point. Now it will not sound at all.
 
I went through the steps outlined above and can make the horn sound with at jumper wire and the relay does not look burned and has continuity through the coil side. I am assuming at this point the problem is in the collum.
 
Are there parts that can fail in the collum?
 
Does anybody have a wiring diagram of the collum?
 
I guess the wire could have shorted or broken or come off a connector in the collum since that seems to be where the issue started.
 
Any ideas what this problem can be?


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John D. Grant "Corvette; Cure for the common mid-life crisis!"
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8/5/12 12:23pm - Reply: 'Re: Can't Blow my Horn'
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

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Dammit....I just spent 20 minutes typing a response, hit "Post", and the dam thing went back to the topic page, without posting....Censored

Anyway...long story short, John....the problem is most likely a break in the wiring in the column. Witht he tilt wheel, the wiring bends, and over time, can cause breaks in the wires, and sometimes the wires will short. If it happens to be the horn ground wire that shorts, the horn will toot until the wire is moved, and contact is lost. Sounds like you're going to be digging into the column. You might be able to find/repair the wiring. If not, you might wind up replacing the turn signal switch.
Would be worth removing the steering wheel and having a look, to make sure it is nothing simple on the top end, but your description of the problem points to a wiring break.Disapprove


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Joel Adams
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8/5/12 5:29pm - Reply: 'Re: Can't Blow my Horn'
jdgrant Gold Member
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HOT SPRINGS NATIONAL PARK, AR - USA

Vette(s):
1978 (25th Annv. Edition)Red, Black interior, 4-Speed Transmission, L-82, Power & Air, Very Rare Option Package(Only 145 Red 1978s with a 4 speed trans) & Very Original Car, with original Window Sticker, Bill of Sale and all documentaion.

Joined: 11/12/2003
Posts: 190
Joel,
Thank you very much for your response and for making me realize my worst fears! lol
 
I do appreciate your response and I know what I will be doing next weekend!
 
Damn, not what I had in mind.
 
That is what I get for driving a classic (old) car.
 
I will post you what I find when I pull it a part.
 
Thanks again,
John


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John D. Grant "Corvette; Cure for the common mid-life crisis!"
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8/5/12 6:02pm - Reply: 'Re: Can't Blow my Horn'
Jeffm Gold Member
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Sebago Lake, ME - USA

Vette(s):
1978 Silver Anniversary L82 4spd (M21) Red Leather. -1978 Pace Car L82 4spd (M21) 20k miles.

Joined: 2/15/2007
Posts: 962
I did replace my horn relay and got all excited when I got my first toot, but not much after that. Hit it just right and once in a while it works. looks like I gotta start checking under the button too.

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8/6/12 5:58pm - Reply: 'Re: Can't Blow my Horn'
ebo Lifetime Member
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Holland Patent, NY - USA

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#1 *1980 White, Red interior 14,000 mile #2 *1980 Red, Oyster interior 93,000 miles Resto project car, rebuilt to 383 stroker

Joined: 6/3/2008
Posts: 4395
Jeff, sort of make's sense as you had no brake lights at eboland!
Evil Smileebo


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8/6/12 7:06pm - Reply: 'Re: Can't Blow my Horn'
Jeffm Gold Member
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Sebago Lake, ME - USA

Vette(s):
1978 Silver Anniversary L82 4spd (M21) Red Leather. -1978 Pace Car L82 4spd (M21) 20k miles.

Joined: 2/15/2007
Posts: 962
ebo said: Jeff, sort of make's sense as you had no brake lights at eboland!
Evil Smileebo
Got that figured out. Pulled the plug on the brake light switch, crossed the connection and shazam, Brake lights. Got a new switch coming.




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8/17/12 11:52am - Reply: 'Re: Can't Blow my Horn'
jdgrant Gold Member
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HOT SPRINGS NATIONAL PARK, AR - USA

Vette(s):
1978 (25th Annv. Edition)Red, Black interior, 4-Speed Transmission, L-82, Power & Air, Very Rare Option Package(Only 145 Red 1978s with a 4 speed trans) & Very Original Car, with original Window Sticker, Bill of Sale and all documentaion.

Joined: 11/12/2003
Posts: 190
As it turns out my horn problem was that the retainer insulator that retains the eyelet above the horn spring popped out and caused my horn to sound.
 
After I removed the horn button and lever spacer I put it all back togther and it works as normal. An easy fix.
 
I do think the insulator that is in the steering collum needs to be replaced because it allowed the retainer insulator to pop out.
 
If anyone else has this particular issue this may be your fix.
 
 
 
 


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John D. Grant "Corvette; Cure for the common mid-life crisis!"
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