Is this horn relay correct for 1972 Chevelle? - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

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post #1 of 16 (permalink) Old Oct 30th, 18, 9:39 AM Thread Starter
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Can someone please tell me if this horn relay is correct for my 1972 Chevelle? I believe the part number for this one is GM# 1115889. My firewall only has 1 factory hole for mounting up the horn relay. If this is not correct can someone please tell me the correct part number to search for? On a 72 there is a fused 10g red power wire that runs from the starter up to the horn relay & also there are a couple of wires that are connected at the relay that the relay supplies power to as well. Pictures are attached below...
Thank You in advance!!!
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Last edited by WILD72; Oct 30th, 18 at 10:05 AM.
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post #2 of 16 (permalink) Old Oct 30th, 18, 10:12 AM
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Re: Is this horn relay correct for 1972 Chevelle?

Not exactly correct for a 72 but you CAN make it work.

I'm pretty sure that all of the originals are long gone, in fact I think I bought the last two myself (a gift for a friend)

I don't recall seeing a repro. so I can't say how close to original they are.

The red power wire is a fusible link, don't use a regular piece of wire.
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post #3 of 16 (permalink) Old Oct 30th, 18, 10:18 AM Thread Starter
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Quote:
Originally Posted by Dean View Post
I'm pretty sure that all of the originals are long gone, in fact I think I bought the last two myself (a gift for a friend)

I don't recall seeing a repro. so I can't say how close to original they are.
Do you have a picture of a correct original?
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post #4 of 16 (permalink) Old Oct 30th, 18, 10:23 AM Thread Starter
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Quote:
Originally Posted by Dean View Post
The red power wire is a fusible link, don't use a regular piece of wire.
I just ran a new 10g red wire with a 14g fusible link wire (Dorman #85620) on the end @ the starter.
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post #5 of 16 (permalink) Old Oct 30th, 18, 10:53 AM
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Re: Is this horn relay correct for 1972 Chevelle?

I'll see if I can find one in my junk
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post #6 of 16 (permalink) Old Oct 30th, 18, 11:43 AM
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Re: Is this horn relay correct for 1972 Chevelle?

I did a little search and found a picture that might be correct for a 1972 Chevelle ?.



Jim
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post #7 of 16 (permalink) Old Oct 30th, 18, 12:30 PM
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Re: Is this horn relay correct for 1972 Chevelle?

Quote:
Originally Posted by Jim Streib View Post
I did a little search and found a picture that might be correct for a 1972 Chevelle ?.



Jim
that's it








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post #8 of 16 (permalink) Old Oct 30th, 18, 12:30 PM Thread Starter
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Quote:
Originally Posted by Jim Streib View Post
I did a little search and found a picture that might be correct for a 1972 Chevelle ?.



Jim
That one looks totally different than the one that I have... while the one that I have "CAN" work. Is there a different one that I "SHOULD" use instead of the one that I have now? The one on my car now, is the one that I posted the pictures of part # 1115889. It works... but I want to know if I should put a different one on there.
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post #9 of 16 (permalink) Old Oct 30th, 18, 12:36 PM
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Re: Is this horn relay correct for 1972 Chevelle?

It's up to you, do you care if it looks original?
You can get a repro.
https://www.google.com/search?source...31.r1F1_ZUJqQA
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post #10 of 16 (permalink) Old Oct 30th, 18, 12:49 PM
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Re: Is this horn relay correct for 1972 Chevelle?

Quote:
Originally Posted by WILD72 View Post
That one looks totally different than the one that I have... while the one that I have "CAN" work. Is there a different one that I "SHOULD" use instead of the one that I have now? The one on my car now, is the one that I posted the pictures of part # 1115889. It works... but I want to know if I should put a different one on there.
The one that Dean shows is an original and the one you have in your first post looks like what is on my 68 Chevy II Nova. Both basically work the same but the original has one less terminal on the underside. This additional terminal on the one in your first picture and like what is on my 68 is for the key buzzer circuit.

For added info on the stud of the relay, this is a junction point for other wires as well as allowing power to get inside the relay. Inside the relay this power is connected to one side of an activation coil and then to a contact point of the relay assembly. On the other end of the activation coil, this goes to one of the terminals on the bottom which then connects to the horn button on the steering wheel. When the horn button is pressed the wire to the horn relay then becomes grounded and energizes the activation coil in the relay and it will click. This click noise is from an arm inside the relay now connecting the power from the stud of the relay to a terminal on the bottom of the relay which then sends power out to the horn(s) and makes them sound (providing they are good and grounded well).

This is an album of the combination horn relay/key buzzer for my 68 Chevy II Nova like what you have in your first picture:

https://www.flickr.com/photos/121766...57653574631828

And how this combination horn relay/key buzzer is wired:



A correct one for a 72 Chevelle would not have the key buzzer portion inside the relay.

Jim
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post #11 of 16 (permalink) Old Oct 30th, 18, 1:20 PM Thread Starter
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I found this part # 3996283 & here is a picture of it. I would prefer to have one that is correct... www.classicindustries.com
has these for $53.00. Is this more along the lines of what I should have on the car? https://www.classicindustries.com/product/3996283.html
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post #12 of 16 (permalink) Old Oct 30th, 18, 1:38 PM
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Re: Is this horn relay correct for 1972 Chevelle?

Yep, that's it and I don't blame you, I would rather have the correct one too.
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post #13 of 16 (permalink) Old Oct 30th, 18, 1:54 PM Thread Starter
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Quote:
Originally Posted by Dean View Post
Yep, that's it and I don't blame you, I would rather have the correct one too.
Thank You!

I just want correct operation with correct parts... Although it works with the one from a 68, I would feel better knowing that I have "THE RIGHT PART" on there. Plus, I dont like the fact that it has the "Key Buzzer" in there & that it shouldn't even be on my car to begin with. Im gonna grab a correct one, put it on & save the 68 one as an emergency back up spare part.

Thanks again guys!
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post #14 of 16 (permalink) Old Oct 30th, 18, 2:12 PM Thread Starter
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Look at this on eBay
https://rover.ebay.com/rover/0/0/0?m...2F302926782666


I just grabbed this NOS one off of EBAY! YAHOO!
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post #15 of 16 (permalink) Old Oct 30th, 18, 4:06 PM
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Re: Is this horn relay correct for 1972 Chevelle?

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