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Old 06-06-2008
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Horn wiring question

I read somewhere that the stock horns get a constant 12v and that the stock horn button is only connecting the ground? Is that true? I have a 2002 Ranger, also if anyone knows the color of the wire that would help too.
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Old 06-06-2008
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IF 2002 is the same as 2000:

They do NOT get constant power (although that is TRUE on many older vehicles, particularly imports. I believe they stopped this practice when they added switches and clocksprings to the steering wheel).

The fuse powers the relay coil (and the horn relay contacts) with the YE/LB wire. Then, YE/LG goes to the clockspring, on to the horn switches, through ANOTHER clockspring contact to Ground (G101 just in front of the battery).

That same power from the fuse (YE/LB) is sent through the (when energized) relay contacts to the horn, which is self-grounding through its mount.
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Old 06-07-2008
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Are you trying to get constant power?

I tie in for constant power to the front of the underhood fuse box. There's a little cover that pops on and off, and there's two studs that the nut takes a 10mm to take the nuts off. I use that for all my aftermarket stuff. Constant 24/7 power.
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Old 06-07-2008
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Nope, I need to wire a relay to the horn trigger for something else.


I will defiantly check out that spot under the fuse box for other things tho, thanks.
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Old 06-07-2008
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I still couldnt find the wire (tested everything with a voltometer) but thanks for the help anyway Earl, its appreciated. I would up just tapping off the wire right at the horn.
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Old 06-08-2008
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If your truck is like my 99, there is only one wire on the horn. That is a positive wire. It becomes positive when the horn pad is pushed in. The horn gets ground by mounting to the body. I had to tap it to with a relay for my car alarm.
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