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Old 07-26-2008, 03:17 AM
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Horn Relay

I need some advice on rewiring a electric horn on a 84 Camaro. There is one single wire running through the fire wall. I'm not sure whether it's running from the horn button or fuse box? I bought a four point relay, but now I'm told that I should have purchased a five point relay. How can I indentify where that wire is running from and what is the correct wiring for the horn. I've tried some of the diagrams posted but I get nothing. I know the horn works because I connected it directly to the horn and it works fine. I'm trying to connect it to the steering wheel center and not have to place a botton somewhere else in the car.

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Old 07-26-2008, 06:22 AM
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Horn Relay

Go to this site and scroll down to Fig. #41 and #42.
The wire should be black. You can put a volt meter or test light on the wire, press the horn rim and see if the light or meter registers. If it does, that's the horn wire. http://www.autozone.com/az/cds/en_us...rInfoPages.htm
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Old 07-27-2008, 01:27 AM
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When you say four point relay I'm guessing it looks like the picture here. If it does that will work fine. A lot of times there is a diagram on the relay to show you how to wire it up. If you need more help I can draw up a diagram tonight that is a little easier to understand.
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Old 08-01-2008, 12:33 AM
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A diagram would be great. I've wired it up exactly like previous diagrams I've seen, but I'm still not getting anything.
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Old 08-01-2008, 03:05 AM
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Most relays have standard numbers for the terminals if yours are different let me know.

30 should be wired to the battery(make sure you put a fuse in)
85 goes to vehicle ground
86 should get +12v when horn button is pushed
87 connects to + terminal on horn

I have seen horns that hook up in other ways so if you do not have +12v coming from your horn button let me know and I can help figure out what you have. The wire colors in the diagram will be different than your car wires, I just borrowed it from something else.
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Old 08-02-2008, 01:25 AM
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If I am not mistaken on your camaro the horn button (when pressed) will send a ground signal through your wiring.
when wired correctly, when you press the horn you will ground the relay which closes the internal switch sending 12 volts to the horn.
Find the wire coming from your horn button and check that you are getting a ground when the button is pressed, if you are wire it up like this.
I drew up this diagram to help you out let me know if this takes care of it.


Last edited by justacertifiedtech; 08-02-2008 at 01:35 AM. Reason: added link
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Old 08-02-2008, 01:59 AM
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I think you are correct about them grounding when you hit the horn button. I have worked on a lot of British and other European cars and some Asian cars and seen some pretty stange ways to hook thing up and I can't remember what is what anymore
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Old 08-03-2008, 01:50 PM
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So on the diagram, is 86 going to ground or is it connected to 30? I understand the rest of the diagram, but I'm not sure I follow 86 and 30? Once I get clarification, I'm going to go out to the garage and give it a try.

Last edited by Chevy 84; 08-03-2008 at 01:58 PM.
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Old 08-03-2008, 02:07 PM
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Both the 86 pin and the 30 pin should get +12v. You can just split the wire right at the relay. The 85 pin should supply the ground when the horn button is pushed.
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Old 08-04-2008, 12:10 PM
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Horn

Well, back to the drawing board. I wired it up and still nothing. There are two terminals on the horn so maybe I should have grounded the horn to the frame of the car. I hate to do it, but I may have to break down and take it to a mechanic and let them re-wire the entire horn. But thanks for all the advice. I'm active duty military and it's time for my yearly inspection and ofcourse without I horn I will fail.
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Old 08-04-2008, 01:31 PM
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If there are two terminals on the horn one of them should be for a ground wire. I'm not sure if it matters on a horn which terminal is which. if it does there should be a + or - next to them. Also try testing to make sure you have a connection when the horn button is pushed
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