Horn problem
Cross-Country
Joined: Jul 2002
Posts: 80
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From: Prescott
Horn problem
[updated:LAST EDITED ON 06-Jul-02 AT 06:11 PM (EST)]I have a 69 f-250 CS. and the horn isn't working. I have the original dealers book and it says that the horn is on a circut breaker with the back-up tail lights and the headlight switch. I have removed the dask and speedo cable to access this area. Problem: I don't understand the switch. Does this Circut breaker re-set or is it time to replace. I have traced all the wiring to the horns and all looks good. I had someone depress the horn while i had a test light and it appears to have no voltage ????
After reading another post in June there might be a relay. any help on where to look and if I might replace it ?
After reading another post in June there might be a relay. any help on where to look and if I might replace it ?
New User
Joined: Jan 2008
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Horn problem
The horn should be on a Fused circuit (NOT a C.B.)with something else like the radio or something.The Horn relay on later models was attached to the inside firewall ,left side,above the brake pedal.
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Post Fiend
Joined: Feb 2000
Posts: 5,130
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From: Brea CA
Horn problem
The horn relay is right next to the starter solenoid. You should be able to hear it "click" when you tap the horn button.
Forget the power from the headlight switch, that's only good for the F500-F750 trucks, the shop manual is misleading.
There is no fuse in the system for the F100-F350 horns. Power comes off a ring lug on the battery side of the starter solenoid and goes to the inside terminal of the relay (fat yellow wire). The outside terminal of the relay is the switched power that goes to the horns (fat yellow w/green stripe). The lone terminal on the far side is the relay wire that goes to the horn button (skinny black wire) and is looking for a ground.
Barry
Forget the power from the headlight switch, that's only good for the F500-F750 trucks, the shop manual is misleading.
There is no fuse in the system for the F100-F350 horns. Power comes off a ring lug on the battery side of the starter solenoid and goes to the inside terminal of the relay (fat yellow wire). The outside terminal of the relay is the switched power that goes to the horns (fat yellow w/green stripe). The lone terminal on the far side is the relay wire that goes to the horn button (skinny black wire) and is looking for a ground.
Barry
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Horn problem
Thanks for showing up Barry.
At least I didn't suggest to look in the Trunk.
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At least I didn't suggest to look in the Trunk.
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Fleet Owner
Joined: Jun 1999
Posts: 24,552
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From: Creedmoor, North Carolina
Horn problem
Brian, Dennis & Barry, I have found grounding to be a culpret as well sometimes. If the wire is hot at the steering wheel horn ring, then the ground is likely bad. We replace engines and don't replace the ground strap on the firewall, also there is a ground around the rag joint. I made a loop from one side to the other with a 2" piece of wire on my blue truck and the horn blows loudly every time now. 
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Post Fiend
Joined: Feb 2000
Posts: 5,130
Likes: 8
From: Brea CA
Horn problem
Very good point John.
'Ya know that skinny little wire coming out of the connector on the relay, stick a pin through it and ground it. The horn should sound. If it does, the problem is most likely in the steering wheel where it can't find a good ground.
Barry
'Ya know that skinny little wire coming out of the connector on the relay, stick a pin through it and ground it. The horn should sound. If it does, the problem is most likely in the steering wheel where it can't find a good ground.
Barry
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