Author Topic: horn relay  (Read 1859 times)

sbmiano

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horn relay
« on: February 02, 2014, 09:02:31 PM »
can a faulty horn relay cause your horns to sound sick or would it be one of the horns.  I had the relay changed out for an original one reconditioned and now my horn sounds like a dying cow lol.  Is the horn relay a thing thta either works or dosent?  My horns worked before with a repo relay
69 z28  Van Nuys 04D Legends Certified
09 viper 5k miles

Mike S

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Re: horn relay
« Reply #1 on: February 02, 2014, 09:22:32 PM »
 If both horns sound bad then I would possibly say yes. The contacts within the relay can get pitted and cause higher than normal resistance. Usually a fine grit emery board will burnish them back into shape.
If the wiring looks solid then I would run a wire from a battery source directly to the horn terminal to see how it sounds. This will bypass the relay circuit. Make sure the ground is good too.

Mike
67 LOS SS/RS L35 Hardtop - Original w/UOIT
67 NOR SS/RS L35 Convertible - Restored

Everett#2390

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Re: horn relay
« Reply #2 on: February 02, 2014, 09:55:11 PM »
You may want to wire brush the wire terminals at both the horn relay buss bar and at the battery junction block next to the battery.
Maybe remove the horns and wire brush ground and the horn bracket for less resistance.
Wouldn't hurt to clean battery clamps and posts and engine ground.
Horns could have water inside making them sound like a sick cow also.
A flashlight is a case for dead batteries.

cook_dw

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Re: horn relay
« Reply #3 on: February 02, 2014, 11:34:46 PM »
There is a square head screw that goes into the horn body.  Take it out and spray WD-40 into the hole.  Then reinstall screw.  Use a wire to run from battery positive side and ground the bracket to the negative side.  Horn should sound.  If it sounds normal then reinstall.  Repeat with other horn. Once reinstalled onto car if horns still sound like before you started then its the horn relay not making proper contact.  This worked for me on many of horns that "stopped working" or "sounded like a dying cow". ;D
Darrell Cook

1967 LeMans Blue SS/RS L35 clone
1968 Rallye Green SS L78 - unrestored original
1968 Matador Red Z28

sbmiano

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Re: horn relay
« Reply #4 on: February 03, 2014, 03:06:27 PM »
thank you for your help!!

cook_dw

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Re: horn relay
« Reply #5 on: February 03, 2014, 03:18:48 PM »
Let us know what fixes the problem.!!. :)

sbmiano

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Re: horn relay
« Reply #6 on: February 04, 2014, 04:50:08 PM »
well checked the horns by wiring them to the battery and they work fine so I think the 830 relay has an issue.  Going to get it replaced at Bob Harris' and see if it is fine.  Mine being an 04D its the black plastic not clear correct?

Everett#2390

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Re: horn relay
« Reply #7 on: February 06, 2014, 12:31:08 AM »
I've only seen a black metal cap.
Plastic may be an aftermarket relay - reduce weight, gain MPG - HA!

KevinW

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Re: horn relay
« Reply #8 on: February 06, 2014, 12:02:13 PM »
he means the black plastic terminal protectors on Factory Delco relays.  69s came with clear or black, which one is correct depends on your build date.

Everett#2390

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Re: horn relay
« Reply #9 on: February 06, 2014, 01:45:05 PM »
Okay. something new to remember.

Rich69s

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Re: horn relay
« Reply #10 on: February 12, 2014, 12:30:39 AM »
What's the cut off date for the black or white relay and what one came. First
1969 L 48 SS Frost Green taken apart in 1979 resurrection forthcoming
1969  Yenko  Purchased 1981 with my student loan check

sbmiano

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Re: horn relay
« Reply #11 on: February 12, 2014, 03:58:18 PM »
white came first and the cut off is late jan 69 to early feb.

Rich69s

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Re: horn relay
« Reply #12 on: February 12, 2014, 05:55:40 PM »
Thank You !