Horn wiring
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New User
Joined: Feb 2015
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Horn wiring
So my 64 f100 has never had a working horn. Someone has modified it with button that has one wire that splits one going to the fuse box and one going to the horn itself. It had another wire that rotted away but it was attached to the horn as well and back to the button but I can't for the life of me figure out where. My question is I want the horn to work as original. I added the components missing for that and nothing. So can someone tell me how it's wired. I am terrible with wiring stuff but going through the dash is helping me figure it out. Thanks all
Lead Driver
Joined: Aug 2003
Posts: 6,305
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From: Boulder Creek, Ca
Does the turn signals work?? Not sure about the 64 wiring circuit, posting a pic of the turn signal and horn circuit out of the 65 Ford pickup wiring manual.
If the turn signal works then possibly the horn circuit is also intact and only require replacing a few items between horn ring and the turn signal switch; the components usually does not cost more than $20, also suggest replace relay switch for few $'s more ??
Suggest pull the steering wheel, likely will need a steering wheel puller, do not suggest using the type of puller wither the long arms clamp onto the plastic portion of the wheel and forces the wheel off the shaft; but rather the type that uses 2 bolts that screw into the steering wheel collar and applies pressure on the steering wheel shaft to remove, if do not have then possibly rent from local auto parts store??
If the turn signal works then possibly the horn circuit is also intact and only require replacing a few items between horn ring and the turn signal switch; the components usually does not cost more than $20, also suggest replace relay switch for few $'s more ??
Suggest pull the steering wheel, likely will need a steering wheel puller, do not suggest using the type of puller wither the long arms clamp onto the plastic portion of the wheel and forces the wheel off the shaft; but rather the type that uses 2 bolts that screw into the steering wheel collar and applies pressure on the steering wheel shaft to remove, if do not have then possibly rent from local auto parts store??
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Cross-Country
Joined: Sep 2014
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Did you pull the horn ring off, and if so is the little horn contact and spring still there? This part brakes or gets lost. 1961-72 Ford Horn Brush and Spring for Turn Signal Switch C2OZ-13A821 is what I had just bought off Ebay. If you are missing yours I can send you one since I had to buy them as a pair, but you only use one.
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New User
Joined: Feb 2015
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I have replaced the horn brushes and the turn signals work. I remembered a trick I used on my ranchero where I touch a small wire where the horn brushes are and the other end the center of the steering wheel to activate the horn. I got nothing which isn't surprising so for now I need a horn just for driving safety so I will try to get the replacement working. But I know now I need to remove the wheel to make it work as original.
Senior User
Joined: Jul 2010
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Yes that is correct...it n should have power constant....horn button triggers the relay that closes the circuit and let's the current flow to the horn itself... I don't remember if it's a ground or actual current that closes the relay... The relay should be wired like a pyramid ... Try grounding the post at the top... See if that triggers relay... If ground doesn't work try putting juice to it see if that triggers relay... If you get nothing ...get a razor blade and try bridging the wire with power to the wire next to it... You should get power to horn then...
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
People went to auto parts stores, they didn't have the parts. So instead of going to a Ford dealer, they mounted an aftermarket horn button on the steering column.
C2OZ-13A821-A .. Horn Brush & Insulator Kit (genuine Ford) / Obsolete
1961/70 F100/250 2WD / 1966/70 F100 4WD / 1971/72 F100/350 (insulator not required) / 1960/64 Falcon/Comet / 1965 Mustang w/a generator.
If the insulator is missing, you'll have to buy a NOS kit, because...
The repro C2OZ-13A821-A does NOT come with the insulator.
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Horn issue
I just acquired a F100 with a dead horn. If you have a multimeter and can check for continuity (Ohms)... the center shaft of your steering column should be grounded to the chassis. Just remove the horn button and check center shaft to body. This is accomplished thru the rag joint on my truck, I don't know about a 64. I had to run a jumper from my steering box to my center shaft because the physical connection on my rag joint was damaged. Once the center shaft is grounded, the horn button applies a ground to your horn relay and closes the circuit to apply 12 volt to your horn. One wire goes to your 12 volt supply, one to your horns and another to your horn button. Your pictured horn relay looks like my 66.