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1948 Ford Truck Horn

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Old 10-11-2018, 11:53 AM
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1948 Ford Truck Horn

I am switching my truck over to 12 V, and had a question about the horn. My wiring loom has one wire to the horn, but my horn has two wires coming out of it. It is a stock horn. Can one of you let me know if the yellow is power and the white is ground, or is the white power, and the yellow ground? Or is there something I have to hook up differently since Iím switching it to 12 V?



 
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Old 10-11-2018, 12:48 PM
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It will work wired either way, but the dark (blue) wire on the right goes to the horn button (ground) and the yellow wire on the left goes to the power source.
Mark
 
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Old 10-12-2018, 12:30 PM
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What Mark says is accurate. The horn motor and body are isolated from grounds. Your horn will sound different on 12 volts too.
 
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Old 10-12-2018, 12:43 PM
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That looks different from the horns I have seen on Bonus Built trucks. Is it the early style that mounted in front of the radiator? The coil is very different. The condenser (inductor?) mounted across the points is interesting too.
 
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Old 10-12-2018, 12:44 PM
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so the white wire gets attached to the wire that comes down thru my steering column and the yellow goes to? sorry a little confused.

What I did to test the horn... I hooked up my white wire to the locking nut (grounding it) and attached my yellow wire to a battery to test. Man was it loud, but it worked. Just not sure how the wiring and button work with a horn. I just wanted to see if it was even working. Yes the 12V made it loud, but I just touched it for a few seconds.
 
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Old 10-12-2018, 12:45 PM
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yes it mounts on the firewall in front of the radiator
 
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Old 10-12-2018, 04:51 PM
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Originally Posted by pezsox View Post
so the white wire gets attached to the wire that comes down thru my steering column and the yellow goes to? sorry a little confused.

What I did to test the horn... I hooked up my white wire to the locking nut (grounding it) and attached my yellow wire to a battery to test. Man was it loud, but it worked. Just not sure how the wiring and button work with a horn. I just wanted to see if it was even working. Yes the 12V made it loud, but I just touched it for a few seconds.
The wire that comes down through the steering column from the horn button is a ground wire. The horn button completes the grounding circuit when it is pressed. The other wire (whichever you choose doesn't matter) is supposed to be hot at all times (I believe that is required by law).

 
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Old 10-12-2018, 04:54 PM
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Originally Posted by pezsox View Post
yes it mounts on the firewall in front of the radiator
Whoa! I can't wrap my head around that.

 
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Old 10-12-2018, 04:57 PM
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Originally Posted by ALBUQ F-1 View Post
The condenser (inductor?) mounted across the points is interesting too.
I believe that was to prevent the radio from "beeping" too. AM radios of the day needed all the help they could get.

 
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Old 10-12-2018, 08:46 PM
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Oops Sorry, meant to say it mounts on the inside fender wall in front of the radiator. Not firewall.
 
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Old 10-12-2018, 10:25 PM
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Originally Posted by Mixer man View Post
I believe that was to prevent the radio from "beeping" too. AM radios of the day needed all the help they could get.
I don't doubt it also keeps the horn's points from pitting just like an ignition condenser protects the ignition points..
 
  #12  
Old 10-14-2018, 10:05 PM
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Does anyone have a pic of how the disk, wire, insulator are installed on the horn button side. I have seen conflicting pics. Are the prongs under or over the insulator or ????

 
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Old 10-14-2018, 10:10 PM
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You have it in the correct position in the last pic, just upside down. That piece is the spring for the horn button.
Mark
 
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Old 10-14-2018, 10:18 PM
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So some side up or dome side down?
 
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Old 10-14-2018, 10:28 PM
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Dome goes down. It holds the horn button up until you press it, then the outside edge touches the copper piece underneath and completes the horn circuit.
Mark
 

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