C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
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Old Oct 4, 2007 | 02:18 PM
  #1  
sly vette's Avatar
sly vette
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From: Algonac Michigan
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I am working on a friends 77 coupe and his horn doesn't work. I have replaced the contact under the horn button(was missing)
Thought that would do it, but noooooooo!
So then I determined that there is no slot for a fuse and no voltage to the relay. No clicking from the relay when button is depressed.
Now I need to know where the relay is located.
The only relay I have found so far is the blower relay over the A.C. on the firewall.
This car has power everything and I am getting the bad feeling that it may be hiding under the cruise control unit.
Please tell me it's in a more accessible location, or at least give me some idea where thit little bugger is hiding!!!
His key buzzer is not working either.
Thanks Guys,
Mark
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Old Oct 4, 2007 | 03:46 PM
  #2  
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markdtn
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From: Chattanooga TN
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Can't speak to 77, but earlier cars have the horn relay/key buzzer on the drivers side inner fender.
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Old Oct 4, 2007 | 03:52 PM
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...Roger...
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From: Dayton, Ohio
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On the 77 the horn relay is right above the fuses-its taped right to the large loom of wires going into the back of the fuse block.
If you want to rule out the horn button wiring going up column then ground the black lead in the harmonica connector.Grounding this black wire will be the same as pushing on the horn button.
You might have 2 black wires in the harmonica conn. the one you want is in position "G" and it will be between the Pink wire and the Light Blue wire.

Last edited by ...Roger...; Oct 4, 2007 at 03:58 PM.
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Old Oct 6, 2007 | 12:40 AM
  #4  
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sly vette
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From: Algonac Michigan
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Thanks guys! I'll let you know how it goes.
Mark
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