Explain the horn relay
Thread Starter
Pro
Joined: Apr 2007
Posts: 736
Likes: 1
From: Chester VA
Explain the horn relay
I'm trying to get my horn working. The relay clicks when I press the horn button, but there's alot going on at the relay and not sure how to proceed. I spent some time with a voltmeter but couldn't determine what's triggering it to engage when you press the horn, or which lead is supposed to energize the horn when pressed. I'm hoping to rewire from the relay to horn but don't know which wire to replace without disecting the entire wire loom.
Le Mans Master
Joined: Jun 2006
Posts: 8,472
Likes: 0
From: Virginia
There will be a green wire that goes from the relay to the horn. Run a jumper wire from the postive wire on your alt. to the horn to see if your horn is good. If it is than you have ether a bad connection or the wire is bad between the relay and the horn. Since the relay clicks that tell me its not in the steering wheel. ( I just had to do all of this with my 78.)
Hope that helps
Adam
Hope that helps Adam
Le Mans Master
Joined: Jan 2000
Posts: 8,918
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From: New Hill NC
Melting Slicks
Joined: May 2007
Posts: 3,246
Likes: 4
From: Bay Area CA
I'ts a simle circiut, but takes a twisted route. Power into one side of the relay,, other side- BLACK wire out into the steering colum up to the back of the steering wheel to circular pad, steering wheel cantact with a spring on it is part of the circiut to the back of the steering wheel, pushing the horn button shorts this part to the steering column shell, which is grounded through the GM rag joint by the metal wires infused in it, to the steering gear, to frame to ground it. When the horn is not pushed, the BLACK wire at the horn relay will be at 12 volts, It's a resistance thing, when the horn is pushed, if everything is working right, this wire should go to near 0 Volts, this is the frist check, if it does not, then the grounding path is bad, if it's not at 12 volts when the h/b is NOT pushed, then it could be a burned out relay. starting points.
Last edited by RunningMan373; Nov 5, 2007 at 05:09 PM.
Le Mans Master
Joined: Jul 2000
Posts: 6,001
Likes: 113
From: Saginaw Michigan
The diagram in this paper may also be helpful.
http://jimshea.corvettefaq.com/wp-co...osis13JN06.doc
Jim
http://jimshea.corvettefaq.com/wp-co...osis13JN06.doc
Jim
Le Mans Master
Joined: Jan 2000
Posts: 8,918
Likes: 27
From: New Hill NC
I'ts a simle circiut, but takes a twisted route. Power into one side of the relay,, other side- green wire out into the steering colum up to the back of the steering wheel to circular pad, steering wheel cantact with a spring on it is part of the circiut to the back of the steering wheel, pushing the horn button shorts this part to the steering column shell, which is grounded through the GM rag joint by the metal wires infused in it, to the steering gear, to frame to ground it. When the horn is not pushed, the green wire at the horn relay will be at 12 volts, It's a resistance thing, when the horn is pushed, if everything is working right, this wire should go to near 0 Volts, this is the frist check, if it does not, then the grounding path is bad, if it's not at 12 volts when the h/b is NOT pushed, then it could be a burned out relay. starting points.
Actually the green wires go directly to the horns, the black goes to the column. And yes the path to ground is convoluted, but it is nothing more than that, a simple ground.
Melting Slicks
Joined: May 2007
Posts: 3,246
Likes: 4
From: Bay Area CA
Noted and corrected. sorry about that. got to check my wireing diagrams and not run from memory,, thanks. Circiut discription is correct though,, with the change of the wire color,,
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