Train Horn Wiring Question - Ford Powerstroke Diesel Forum
 
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post #1 of 6 Old 02-04-2008, 08:21 AM Thread Starter
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Train Horn Wiring Question

Hey guys,m

I have a quick question. I was installing my new train horn on an early '99 F-250 last night and I ran into a snag. I want to use my factory horn "button" with a toggle switch so that I can go between my stock horn and my train horn without an additional button.

My question is:

Does anyone know what color the horn wire is on an early '99? I have seen in a couple of previous posts where guys tapped into a yellow wire with a green tracer. Mine is not that color (at least that I can find under the dash). I would really appreciate if someone could give me a hand if you have a wiring diagram or just general knowledge.

I will post pictures / video when I get done.

Thanks!

===Russell
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post #2 of 6 Old 02-04-2008, 08:25 AM
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I'm not sure on the color, but najaf4life did what you are wanting to do with the toggle switch. Shoot him a PM and see if he remembers. GOOD LUCK


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post #3 of 6 Old 02-04-2008, 09:04 AM
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just go to the horn and follow the wire back as far as ya can and tap it there..thats what I did..

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post #4 of 6 Old 02-04-2008, 09:56 AM Thread Starter
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I would, but it is painful to get to. I was trying to see if anyone already knew what color it was. Thanks!
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post #5 of 6 Old 02-04-2008, 04:50 PM Thread Starter
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I found a solid dark blue wire underneath the dash that has 12 volts until the horn is depressed. When you blow the factory horn this wire drops to 0 volts. I am sure this is hooked to the horn relay. Does anyone know if I can use a relay from here to energize the train horn? Any other thoughts?

Thanks!

===Russell
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post #6 of 6 Old 02-04-2008, 05:01 PM
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yes the terminal #87 on the horn relay is what i used, just hook your air horn trigger wire to that terminal and install a switch on/off switch, then you can choose either the factory horn or factory with train horns. I think it's relay # 3 in the under dash fusebox

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