BADASS of New England

An automobile club for the enthusiast who enjoys the last of the big GM cars. The rear wheel drive B and D bodys. Chevrolet Impala SS, Caprice, 9C1, Buick Roadmaster, Oldsmobile Custom Cruiser, Cadillac Fleetwood
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 Horn wiring question

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Posts : 4211
Join date : 2009-12-16

PostSubject: Horn wiring question   Mon Apr 30, 2012 2:48 pm

I took apart the dash to finish some mods today. In my 96 '9C1, the horn didnt work when I bought it. Assuming it was cut when they swiped all the police stuff out, I hooked up a circuit, from the horn fuse, to a button, then to one of the horns. It works perfect, but I have a dumb horn button now.

So anyway, today I found 2 snipped wires of equal length. one on either side of the underside of the bottom of the steering column. One is light blueish and I believe the other is green. They look factory, have transparent white connectors to the column harness going up, but I cannot find where the would have gone to under the dash. I assume they had an air horn inline with the horn circuit like the department I worked for had the "Thumper" hooked up to.

Is this the horn curcuit? How the heck do I hook them back up to the steering wheel? Thanks for any and all help with this!
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Posts : 4278
Join date : 2009-03-20
Location : Revere, MA

PostSubject: Re: Horn wiring question   Mon Apr 30, 2012 3:43 pm

On the impalas (assuming same) there's a black wire to the horn slip ring gnd to the gnd side of the horn relay (convenience center) & a dark grn (always power)to the contact on the horn relay.


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Join date : 2009-01-21
Age : 29
Location : NH

PostSubject: Re: Horn wiring question   Tue May 01, 2012 12:31 am

All my 9C1s had the horn wire cut at the top of the driver's inner fender. green wire IIRC. I think it was common practice to wire the horn (button) up to the siren. Find the schematics at
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Join date : 2009-12-16

PostSubject: Re: Horn wiring question   Tue Aug 28, 2012 3:49 pm

Thanks Steve and Jim. With the help of the service manual diagrams and a test light. Found the problem. Hint: RPO 6J4
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PostSubject: Re: Horn wiring question   Today at 4:18 am

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