Adding horn button....
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Joined: Jun 2003
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Adding horn button....
I bought a button at wally-world that's supposed to be connected to negative/ground and to "horn wire" but I can't find the wire that makes the truck horn work.
What color is the horn wire under the dashboard? (I don't want to take off the steering wheel.)
Thanks in advanced....
71-f100
What color is the horn wire under the dashboard? (I don't want to take off the steering wheel.)
Thanks in advanced....
71-f100
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Senior User
Joined: Jun 2003
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Yes. The blue & orange wire from the horn is that color, but when I try to find it under the dash, I can't find it there?
Also, I connected the the button to the blue/orange cable, and to the negative battery terminal and nothing happened.
Am I connecting it wrong?
Also, I connected the the button to the blue/orange cable, and to the negative battery terminal and nothing happened.
Am I connecting it wrong?
Senior User
Joined: Aug 2001
Posts: 212
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From: Wimberley, TX
The horn is activated by the horn relay. It is located on the radiator core suport near the voltage regulator. When you press the horn button (rim) on the steering wheel, it connects the horn wire to ground causing the relay to activate, and in turn, activates the horn.
Senior User
Joined: Jul 2003
Posts: 193
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From: BC, Canada
I'm experiencing some difficulties with the horn system myself, on my '67 F100. The PO had installed a horn button on the dash and wired it from the fuse box, to the switch and directly to the horns instead of replacing the worn rag joint which caused the original horn button not to work. Now I can't find the original wiring to connect it back properly.
The horn relay? I have what appears to be a relay mounted on the passenger inner fender, a three prong triangular shaped relay which I am assuming is the horn relay, but it has been disconnected and the harness is just dangling beside it. Can anyone confirm my suspicions on this?
The horn relay? I have what appears to be a relay mounted on the passenger inner fender, a three prong triangular shaped relay which I am assuming is the horn relay, but it has been disconnected and the harness is just dangling beside it. Can anyone confirm my suspicions on this?
Posting Guru
Joined: May 2003
Posts: 1,393
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From: Thomson, GA
yup- thats it. It should have a large yellow wire going to it from the starter solenoid so it has power at all times. The blue/orange wire should be in the same harness as the turn signal stuff coming out of the steering column.
Lead Driver
Joined: Jan 2003
Posts: 9,893
Likes: 12
From: Ohio
The relay has THREE wires. The large yellow is the main power. The blue/yellow tracer is the ground wire that runs to column. The other wire runs to horns themselves.
If you ground the blue wire anywhere the relay with function and activate the horn.
Look at the wiring running up the column for turn signals, it will be there. Connect off it there and hook to button. Hook other side of button to a ground somewhere(like the screws used to hold button). If you get NO click from relay, then the relay is possibly dead or you have no power to it.
Use a volt meter to check the connections to see what is not working. Ground the blue wire under column and then check for continuity at relay. It should read between terminal and ground. Then check for 12volts. If both good, then it's the relay.
Larry
If you ground the blue wire anywhere the relay with function and activate the horn.
Look at the wiring running up the column for turn signals, it will be there. Connect off it there and hook to button. Hook other side of button to a ground somewhere(like the screws used to hold button). If you get NO click from relay, then the relay is possibly dead or you have no power to it.
Use a volt meter to check the connections to see what is not working. Ground the blue wire under column and then check for continuity at relay. It should read between terminal and ground. Then check for 12volts. If both good, then it's the relay.
Larry
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