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Thread: Horn issue

  1. #1
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    Horn issue

    Having issue with the horn not working, tested the 2 cables to the horn 1 is earthed which i have tested. The other goes back to the pin on the column under the steering wheel which i have also tested but should this be live.
    Any ideas.

    Cheers

  2. #2
    Join Date
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    Has the horn itself died ? Run alternative earth and alternative +12V to the horn from the battery and see. I’ve had a number of horn units stop working. Also, is there a relay in the +ve side which may be duff ? Otherwise my guess would be an earthing issue - I learned this from the Master - Denis Ooglyoodoo.
    David (AKA Firestarter29)

    Lead, follow, or get out of the way.

  3. #3
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    Hi
    You also seem to be having problems with your Smiths oil pressure gauge, http://www.cobraclub.com/forum/showthread.php?t=62781.
    Could the two problems be related, be it a poor 12volts or voltage regulator fault?
    Seems a bit suspicious to me.

    Russ.
    Joint Area Rep - East Midlands Region
    1984 DAX Cobra
    Rover 3.5 V8 with Holley carburetor.

  4. #4
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    Check out this thread

    http://www.cobraclub.com/forum/showthread.php?t=60584

    there are some good descriptions of how the horn wiring should be.
    Cheers
    Steve

    My missus asked me to build her a Cobra! – How good is that!

    AK Gen2 chassis arrived 12/2/15 IVA Passed 2/7/18 on road 29/7/18
    http://stevesakcobrabuild.blogspot.com

  5. #5
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    Quote Originally Posted by RCAK View Post
    Having issue with the horn not working, tested the 2 cables to the horn 1 is earthed which i have tested. The other goes back to the pin on the column under the steering wheel which i have also tested but should this be live.
    Any ideas.

    Cheers
    Of the two wires on the horn, one is live, the other switches to earth through the steering wheel.

    At the steering wheel the plunger should be live (with the horn connected).

    I had to fit a jumper wire on mine to leap over the rubber connecting boot on the column.

    You need to assume that the column earths through the rack, so it needs an electrical circuit from the steering wheel to the rack.
    Regards

    Craig Perry

    No, I'm not "repairing" it, I'm fine tuning its performance.

  6. #6
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    I have tested the 2 wires to the horn 1 is earthed but the other isn't live but it does go to the pin plunger on the column.

  7. #7
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    Are you using AK’s loom??

    I’m almost positive one of the wires on the horn should be live (with the ignition on), the other should be earth (but only when the horn is pressed).

    The live should be the one that DOESN’T go the column.
    Last edited by cperry; 26-08-20 at 08:35 PM.

  8. #8
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    yep AK loom

  9. #9
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    Stupid question, sorry, but you had the ignition on and no fuses blown?

    What colour are the wires on the horn, both should be black/blue??
    Last edited by cperry; 26-08-20 at 08:40 PM.

  10. #10
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    yep checked that, both black/blue cable.

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