1966 f-100 Horn wire
 

might anyone know what color wire, or how to identify the wire that comes down the column from the horn button ?? Is this actually a hot wire,, or is it a ground wire that the button makes ground to blow the horn ?? I remember years ago having to get a good connection around the rag joint,, so I am thinking its a ground..... This truck has a seperate horn "switch" now, just above the ignition,, but I want it back stock....Thanks in advance for help....Dan

1961/66 F100/250 2WD (1967/70 F100/350):

The horn works thru the T/S switch, there is no separate wire.

On the outside of the steering wheel, below the horn button or horn ring is a hole. The horn brush and its nylon insulator (C2OZ-13A821-A-kit) are hand pressed into it.

Peeps remove the steering wheel, tilt it...the horn brush (sometimes the insulator) falls out. Then, when they reinstall the steering wheel, they wonder why the horn no longer blows.

The horn brush has a tiny coil spring connected to a thin copper wire. It snaps, the horn no longer blows.

The nylon horn button/horn ring retainer (C2DZ-13A809-A) has three "ears" on it. When one or more of the ears snap off, the button/ring fits catty-wampus...the horn may not blow as a result.

Inside the horn ring is the horn blow pressure pad (CODF-13A813-A). It's rubber, flattens out over time. The horn then blows constantly.

Peeps are unaware of this pad, so they disconnect the horn, usually by pulling the wire off the horn relay...located on the right fender inner apron, adjacent to the starter solenoid.

The relay can short out...usually caused by water dripping onto the apron.

Well, the turn signal switch will not cancel,, so do I need to get an entire T/S switch,, or what ?? ... What wire coming out of the T/S harness goes to the horn ?....Dan

There is a plastic cancelling cam on the T/S switch. If the signals won't cancel, it has broken.

You can buy a replacement cam at autoparts stores, but it doesn't fit worth a damn and so...is a b!tch to install.

C9TZ-13341-C .. T/S Switch / Available from Ford / MSRP: $61.98 // FTE sponsor PARTSGUYED.COM price: $44.63.

Applications: 1965/66 F100/250 2WD / 1966 F100 4WD / 1967/68 F100/350 / 1969 F100/350 before serial number G30,001.

I haven't a clue which wire is for the horn. I know less about electricity than a mule knows about tap dancing!

I was a Ford partsman, not an electrician.

I'll be dog.....I found something you did not know......
You are human,,, a walking, talking, ford parts computer...:-X21
Thanks for your help...Dan

Wiring Diagram
 

Here's a pretty good basic schematic.
Has colors and what not?
I printed both pages at about 125% and taped them together in the center so I can read it better when I am working on the truck.
Looks like White with a Blue stripe?

Bill, do you happen to know if anyone has the horn brush and insulator? the 63 is missing em.

Ford sold the horn brush and insulator (1 each) as a kit: C2OZ-13A821-A

Carpenter's 1957/66 truck repro parts catalog (2011 paper version) pictures the horn brush on page 20, uses this same part number, but the insulator is not shown or made mention of.

If you need the insulator(s), suggest you call and ask if the insulator comes with the brush: 800-476-9653.

If not, while obsolete, there are 100's of these kits still available from Ford Dealers/obsolete parts vendors.

C2OZ-13A821-A .. Horn Brush & Insulator Kit (takes 1 or 2) / Obsolete

'Local' sources:

TOM HILLIER FORD in Escalon CA has 3 = 209-838-3535.

SUSANVILLE FORD in Susanville CA has 4 = 530-257-7978.

Not so local sources:

PARTS INTERNATIONAL in Farmers Branch TX has 50 = 888-727-0418.

GREEN SALES CO. in Cincinnati OH has 132 = 800-543-4959.

I am not sure if it is the same on the 66 as it is on the 64 I would bet it is... but the horn wire on mine is blue with a yellow stripe... it is just a ground from the relay to the horn button... I just changed mine out this past weekend so I had to figure which was which. I had a bad horn contact in the TS switch some of the switches have a plain yellow wire for the horn button, but most I have seen are the blue with yellow stripe. Hope that helps! The horn contact AKA brush is wired through the TS switch.. so you have to buy the whole caboodle. If it is not canceling, and you are having horn issues.. just get a new switch! Replacing the cam only helps if it will not cancel as you turn the wheel. On mine though the metal cam on the wheel itself was broken , not the plastic witch cam.... NPD has the switches pretty reasonably priced, and The Truck store in Orange CA. has the metal cancel cam!

The T/S switch used on 1963/64 F100/250 2WD's (C3TZ-13341-B) is 1963/64 only.

The steel cancelling cam (C3MY-13318-A) that attaches to the underside of the steering wheel is the same: 1963/67 F100/250 2WD, 1968/70 F100/350.

Bill the replacement switch I got, I was told by both contacts that you refered me to is now the same for 64-66 I purchased the part they told me was correct, it is Repro. with the ford labeling, and it works just fine in my 64 it had one minor difference, but it didn't effect the operation at all. they told me that the 64 switch is now obsolete, except for cheap chinese knock offs, which was what the PO had in it.

contacted :

C3TZ-13341-B .. T/S Switch-1963/64 F100/250 2WD / Obsolete

GREEN SALES CO. in Cincinnati OH has ONE = 800-543-4959.
wanted $85 plus shipping for equivalent

ANTIQUE AUTO SUPPLY in Arlington TX has ONE = 817-275-2381.
wanted $125 plus shipping for a repro and they were not sure it would fit.. with no return on electrical

Got the switch through NPD for $45 PLUS SHIPPING it was the same switch and manufacturer as Green Sales offered

The repro switch might be the same, but the genuine Ford original switch is not.

Different part numbers: Different switches.

I just got off the phone with the parts guy at Tom Hillier Ford and he is saying that that part number comes back to a 4 pack of the brushes but no nylon insulators. He described the part as the brush, spring and a brass piece at the bottom of the spring. He also said he had nylon insulators separate from them but he didnt know if they were the right parts. Is there a part # for just the insulator?

Just a piece of advice from my experience. Check out your horn relay as well, I fought with my horn until it dawned on me to chase the whole thing to the horn. My issue was the relay on the right inner fender.

Parts cluck at Hillier Ford needs to open his peepers and take a look-see:

1965/72 Ford Passenger Car Parts Catalog (final printing 5/1975) / Text. Section 137, Page 23:

C2OZ-13A821-A .. HORN BRUSH and INSULATOR KIT

1964/66 Thunderbird / 1965 Mustang w/a generator.
---------------------------------------------------
1964/72 Ford Truck Parts Catalog / Text, Section 134, Page 27:

* C0DZ-13A824-B .. Horn Brush - less Insulator = replaced by: C2OZ-13A821-A

1964/66 F100/250 2WD / 1966 F100 4WD / 1967/70 F100/350.
------------------------------------------------------------
1957/63 Ford Truck Parts Catalog / Volume II Text, Section 134, Page 1708:

* C0DZ-13A824-B .. Horn Brush - less Insulator = 1975 FoMoCo Obsolete-Supercede-Interchange Catalog sez: replaced by: C2OZ-13A821-A

1961/63 F100/250 2WD
-----------------------
1960/67 Ford Passenger Car Parts Catalog (loose leaf-printed 10/1967) / Text, Section 137, Page 20:

C2OZ-13A821-A .. HORN BRUSH and INSULATOR KIT

1960/64 Falcon / 1962/64 Fairlane / 1963/64 Galaxie / 1964/66 Thunderbird / 1965 Mustang w/a generator (before 8/23/1964).

At some point after 10/1967, FoMoCo split up this catalog into two: 1960/64 Ford Passenger Car (Volume I & II bound paper) & 1965/72 Ford Passenger Car (loose leaf).
-----------------------------------------------------------------------------------------------------------------------------------------------------------------
* C0DZ-13A824-B .. Horn Brush-less Insulator / Obsolete/Replaced

JST AUTOMOTIVE in Lebanon TN has ONE = 615-443-3086.

WESLEY OBSOLETE PARTS in Liberty KY has THREE = 606-787-5293.

GREEN SALES CO. in Cincinnati OH has TEN = 800-543-4959.

CARPENTER NOS OBSOLETE PARTS in Concord NC has TWELVE = 800-476-9653.

No Ford Dealer, no other obsolete parts vendor has any.