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Horn help needed

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Old Feb 22, 2015 | 12:55 PM
  #1  
dstraw's Avatar
dstraw
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Horn help needed

I installed a new horn and used my test light connected to the positive battery terminal, still no sound?


 
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Old Feb 22, 2015 | 05:27 PM
  #2  
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bkaul
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From: Knoxville, TN
I believe the horns on these are a low-side switch (i.e. switch ground, not power) through a relay ... have you checked the relay, the button, and ground continuity at each location?
 
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Old Feb 22, 2015 | 07:03 PM
  #3  
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From: NorCal
That looks like an aftermarket horn which requires a separate ground and power wire. The steering wheel horn button provides a ground to the horn relay which then powers the horn directly from the battery.

Haven't ya ever noticed that only one wire connects to the stock Ford horn??? That should have been a clue.

HONK!

.. if your horn isn't working, the bridge over/thru the steering coupler ("rag joint") could be broken. In that case, install a jumper wire over the coupler. EZ.
 
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Old Feb 22, 2015 | 08:17 PM
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Bio silver you are missing an important detail. The light would not be on if the 2nd terminal is not grounded.

If you have power n a ground, it most likely is a bad horn
 
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Old Feb 22, 2015 | 08:50 PM
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Originally Posted by maytea
Hio silver you are missing an important detail. The light would not be on if the 2nd terminal is not grounded.

If you have power n a ground, it most likely is a bad horn
I didn't miss anything. I covered the basic horn circuit operation so maybe the OP can deduce WTF is going on.
 
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Old Feb 22, 2015 | 11:05 PM
  #6  
F-250 WARHORSE's Avatar
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From: starship enterprise
Does it have power? Does it have a ground? Then this is your problem. Power does nothing without a ground, and a good ground does nothing without power. YOU NEED BOTH!! Make sure that the horn is grounded, powered, and switched. You do not need to build rockets in your spare time to work on these but since the technician today goes for his MATCO scan tool before anything, he has lost trackof the fundamentals of basic operation. Good luck.
 
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