Horn not working - horn relay clicks loudly instead - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

 
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post #1 of 10 (permalink) Old Mar 17th, 10, 4:29 PM Thread Starter
 
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Horn not working - horn relay clicks loudly instead

Info:

- 1970 monte carlo (I realize it's the wrong forum ) but should be the "same"
- It seems the horn relay is used as a main power distribution block too, it gets juice from battery, it has good ground etc... it all looks good
- horn used to work and I had to replace the engine with newer setup, it hasn't worked since but it has been 3 years since I started the work. Harness is the same, there is a single wire going from the horn regulator to the horns behind the grill , it seems pretty straight forward

I can press the steering wheel horn and get a LOUD click (I'm assuming from the horn relay), but no sound.

Battery is charged enough to start the car so I'd imagine it can do a beep or two.

Any ideas? any help would be greatly appreciated

Here's a photo: I since then cleaned up the wiring a bunch and the external regulator is gone, but the horn did not work before or after... if I recall correctly the wire with arrow pointing at it is the one going to the horns (I'm 80% sure at the moment, I will double check).

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post #2 of 10 (permalink) Old Mar 17th, 10, 4:39 PM Thread Starter
 
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Re: Horn not working - horn relay clicks loudly instead

I may have answered my own question by searching again, I searched at first but didn't stumble on tihs pic in another thread, maybe it will help someone else.

at least now I have some things to check

does this sound good?

1) take the green wire to + on battery , horns should go off? If they do
2) take the black wire , pull it off and ground that terminal to a good ground (- on battery) , if the horns work then it means something in the steering wheel isn't grounding?


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post #3 of 10 (permalink) Old Mar 17th, 10, 5:03 PM
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Rich
 
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Re: Horn not working - horn relay clicks loudly instead

If the horn relay is clicking when you press the horn button, the problem isn't in the steering column......

The problem is probably either a bad ground at the horns or the horns themselves are no good. Look inside them, any signs of little bugs building nests in there?

Yes, green wire to 12v and the horn should sound. Just make a jumper wire, attach it to the spade on the horn(s) and touch the other end of the wire to the positive battery post and it should sound. If not, check the ground at the horn, it is grounded through where the horn bolts to the car. Make sure that connection is clean and tight. If it still won't blow, the horn is no good.

RE: your photo above, I hope the battery is disconnected while you are handling that!
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post #4 of 10 (permalink) Old Mar 17th, 10, 5:15 PM Thread Starter
 
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Re: Horn not working - horn relay clicks loudly instead

that 2nd photo isn't mine, I dug it up somewhere on this forum 5 minutes after I made this thread

thanks for the reply though, I'll do what you said and we'll see where it gets me
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post #5 of 10 (permalink) Old Mar 17th, 10, 5:34 PM
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Re: Horn not working - horn relay clicks loudly instead

What Rich said and also from the looks of all the surface rust you have going on there and the extra possible wire splices under the black tape and bad grounds. Looks like you have some serious cleaning to do there and get some good connections for electric.

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post #6 of 10 (permalink) Old Mar 17th, 10, 10:39 PM
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Re: Horn not working - horn relay clicks loudly instead

Like what has been said. ground bracket , 12volts to horn terminal. If they dont sound , they are bad. Battery should have a charge they require about 5 amps each. gary

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post #7 of 10 (permalink) Old Mar 17th, 10, 10:42 PM Thread Starter
 
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Re: Horn not working - horn relay clicks loudly instead

thank you everyone, I Definitely didn't try to see if the horns are grounded properly. I do remember the green wire's relay connector being quite rusty and oxidized, maybe I'll pickup a new relay if autozone still carries it.

the previous motor had a terrible blowby/venting issue covering everything in sight with oil and grime so I have my work cutout for me.
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post #8 of 10 (permalink) Old Sep 7th, 14, 4:17 PM
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Re: Horn not working

Bringing this post back to life. I recently replaced my wiring harness and steering wheel in my 1970 El Camino. I replaced a non-original spoke steering wheel with an original 1970 steering wheel. I replaced the canceling cam (original I broke) with the correct non-tilt cam. Mounted the new steering wheel, inserted the spring and then the wire connector into the canceling cam spring, pushed it in to lock it. I cannot get the horn to blow.

The door buzzer works. I did test the horns, they work (connect horn to battery), I did test the black horn wire connector pin with a test wire from the connector to the battery ground, the horns did not sound. My guess is it is in the steering wheel horn assembly.

Can I connect a tester to the black horn wire on the wiring harness coming from the firewall. Press the horn to test and see if it is getting an actual connection when I press the horn button? Not sure if I will see a change in voltage when pressing the horn button on the wire... or is there a better way to verify it is the steering wheel?

Steve Petzer - Richmond, VA
Daily Driver 1970 El Camino Custom NOM 350/300HP
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post #9 of 10 (permalink) Old Sep 7th, 14, 9:49 PM
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Joe
 
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Re: Horn not working - horn relay clicks loudly instead

Steve,

First thing, verify horn relay operation with the horns connected to it.

Using the above picture as a guide, take a scrap test wire. Touch one end to a good clean ground (or even the battery negative), take the other end and stick it up into the connector where the solid black wire is connected. Does the horn sound?

If it does sound, the horn relay and connections are good, leaving the wiring to horn (the black control line) in question.

Locate the black wire in the column "harmonica" connector with all the turnsignal wires at the underside of the steering column. (Do not confuse it with the other black wire who's partnered with the pink wire apart of the key minder buzzer). You can stick a test light or volt meter probe on this horn control black wire. You should have 12 volts on this wire if the horn relay connections are in place and good to go.

Report back on your findings.

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post #10 of 10 (permalink) Old Sep 8th, 14, 4:29 PM
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Re: Horn not working - horn relay clicks loudly instead

Thanks Joe. I have a wire with clips. Clipped one end to the terminal where the black wire from the wiring harness goes in the horn relay and grounded on the negative battery side. Horns did not sound. Looks like it may be the horn relay. I have tested through the green wire to the horns and that all works. Expect I need to replace the horn relay. Will grab one while at the Charlotte Auto Fair in a few weeks. Thanks for the help.

Steve Petzer - Richmond, VA
Daily Driver 1970 El Camino Custom NOM 350/300HP
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