My horn honks when i turn on or off car whith lights on - Ford Powerstroke Diesel Forum
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Old 03-17-2014, 07:04 PM
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My horn honks when i turn on or off car whith lights on

hey all, I have 04 f350 and the previous owner apparently used the truck as a work truck up and Alaska, so if I have the head lights on and put the key in the ignition the horn honks continuously but if I start the truck first then turn the head lights on it wont honk(but the horn works). Now if I turn the truck off with the headlights on it will honk continuously until I turn the lights off. Also the cruise control doesn't work but if I try to set it it will honk. the truck use to have work/strobe lights hook up but was all removed.

How do I fix this??? I hate not being able to have the headlights on with out starting the truck

Thanks guys!
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Old 03-18-2014, 03:22 AM
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Originally Posted by PNW6.0 View Post
hey all, I have 04 f350 and the previous owner apparently used the truck as a work truck up and Alaska, so if I have the head lights on and put the key in the ignition the horn honks continuously but if I start the truck first then turn the head lights on it wont honk(but the horn works). Now if I turn the truck off with the headlights on it will honk continuously until I turn the lights off. Also the cruise control doesn't work but if I try to set it it will honk. the truck use to have work/strobe lights hook up but was all removed.

How do I fix this??? I hate not being able to have the headlights on with out starting the truck

Thanks guys!
What a wiring nightmare. Do you know if the wiring for the strobe lights was into one of the upfitter switches?
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Old 03-18-2014, 03:25 AM
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It had after market switches along with a sepate fuse panel, I followed all wires and removed them cleanly, noting was hooked into the truck harness
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Old 03-18-2014, 04:01 AM
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Originally Posted by PNW6.0 View Post
It had after market switches along with a sepate fuse panel, I followed all wires and removed them cleanly, noting was hooked into the truck harness
I am looking through the wiring schematics to find you an answer
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Old 03-18-2014, 04:03 AM
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Thank you!
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Old 03-18-2014, 05:29 AM
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Thank you!
Does your vehicle have auto lamps?
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Old 03-18-2014, 06:45 AM
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Looking through the schematics, the only place where I find either of the two positive wires in close proximity is in connector C270h on the back of the CJB (Fuse box) See Pic below. Looking at the ground wires, the horn and headlights are on the same wire. Your horn relay is activated when you depress the horn pad. It seems to me that the ground from your horn may either be broken, corroded or loose causing the contact in the circuit to work intermittently. This being said, this would cause the horn to use the ground from your headlights which in turn would activate the horn when the lights are turned on.


Last edited by rick1067; 03-18-2014 at 06:50 AM.
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Old 03-18-2014, 06:49 AM
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the strange part is the way he can manipulate the problem by turning headlights on or off before the ignition
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Old 03-18-2014, 06:52 AM
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Originally Posted by ZMANN View Post
the strange part is the way he can manipulate the problem by turning headlights on or off before the ignition
You should be able to turn the headlights on without the key even in the truck. This would be why the bell dings when you take your key out and the headlights are left on.
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Old 03-18-2014, 09:37 AM
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Ok I will look into the ground, but its almost like some wired the horn insted of the ding noise when you leave lights on, thanks
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