Here's the accessory Rotunda dual air horns for the Ranger. This set was shipped from a Ford dealership in Flora, IL to a customer address. Postmarked October 14, 1965 and appears to have been .72 postage to mail it!!

C6TZ-13A800-A Air Horn Dual Unit Kit 1





The air compressor that runs it is a pretty cool little unit that runs off of engine vacuum. Originally patented in 1948. Here's the link to the patent - some interesting reading, at least.

https://docs.google.com/viewer?url=p.../US2630102.pdf


C5AZ-13801-A Vacuum Air Horn Compressor Assembly 1
Superceded by C5AZ-13801-B



Sticker on the side of the air compressor. The filter plate is where it draws fresh air in through.



Chad

.

 

That is a fascinating read... Well, for those of us who like that kind of thing. I'm helping my brother with the automatic level control on his '67 Eldo; now I see where the pump design came from. I still really can't get my head around the fact that manifold vacuum of 20" or less can be transformed into 200psi to the Superlift shocks, but it does.
There are millions of similar pumps in GM cars (others?). I hope Mr. Osburn was rewarded for his genius and his patience - six years!
Eric

 

Instead of the PDF - if you instead open the full filing information and then scroll to the bottom of the screen you can see others that reference this patent. See if it jives with what you are saying...lol.

https://www.google.com/patents/US263...3XDWYQ6AEIKDAA

Some of the early wiper systems were vacuum operated, too, and the wipers would slow down or speed up depending on the strength of the vacuum source. Remember that? See the patent citations, also.


Chad

.

 

I'm guessing that you'll need a storage reservoir to use with the horns, or can the compressor provide enough air "on demand"?
I regret that I do remember vacuum wipers - the original "intermittent" wiper - and having to back off the gas to let the wipers make a pass when running that old '54 Monterrey wide open up a steep hill in the pouring rain.

 

ND would have to chime in here if he knows of an older part number, but I have already ordered the Air Horn Reservoir that was used on 1973 and later trucks. I don't see any older part number that corresponds to an earlier reservoir.

D3AZ-13A888-A - Air Horn Reservoir Assembly (Use with vacuum air horns)

You can search the forums on a couple of these numbers (here and above) and find few other posts - some of these dual air horns were painted. These older Rotunda branded chrome ones have always caught my eye.

Here's a thread that ND chimed in on as an example - one of the few talking about these air horns that I've found
https://www.ford-trucks.com/forums/1...ike-or-nd.html

I suspect the air compressor will blow the horn by itself but probably not for a sustained duration without falling off fairly quickly. The reservoir I imagine bridges that gap and allows for a more sustained full volume. At about 130db it should be plenty loud.

Chad

.

 

They also made a Ford branded air horn that looks very similar. Note the 5 Phillips screws holding together each diaphragm. I believe these came along after the Rotunda branded ones.



Chad

.

 

How big are these horns? Where are you planning on mounting them?

 

The horns are roughly 16" from stem to stern. They can be mounted in a few places, but the most common I see is the top of one or the other inner fender (a.k.a. apron) or I see on cab-overs where the horns are often on the roof. You can operate this setup using a either pull chain valve or an electrical switch.

Here's a unique approach to mounting of air horns, I thought.

https://www.flickr.com/photos/42945203@N00/4825016599

Chad

.

 

Here's the page from the 1966 owners manual showing the horn for those who had not seen it in the other thread where they were asking about horns.



These Rotunda and Ford branded horns were made by the Hadley Manufacturing Company. If Eric refers back to the patent for the vacuum air compressor it is written that Mr. Osburn was doing the work for Hadley.

Here's a Hadley horn with a GM part number. The tops of the horns say Hadley Mfg. Co. so these aren't GM branded. But, same basic horn and notice the air compressor and extra large reservoir.

NOS!! OEM Factory Optional Equipment Hadley 2233962 Air Horn Chevrolet GMC Truck

Here's a picture from Hadley's web site and you can see the same style of horns both on the wall behind the guys at the work bench and then the woman is packing a box full of them in the lower shot.



Here's the page I snagged the photo from and it gives some more info.

The Hadley Story | Hadley

Chad

.

 

Pretty cool. I may need to add air horns to the list of things to put on my truck.

 

Here's some of the individual parts that make up the parking brake assembly.

Parking Brake Lever Sector B7C-2790-A 1



Parking Brake Lever Pawl OM-2786 1



Parking Brake Lever Pin OM-2859 1



Parking Brake Release Handle Assembly - Includes C0DZ-2819-A pin C1TZ-2760-A 1



Chad

.

 

Sort of interesting - this is going to look a little different to some - as I was looking at pictures of the emergency warning circuit and how it was often a small separate harness of it's own, like this one or the one that CropDuster was showing....



I thought about my own truck and thought I'd share. Since the emergency circuit was standard equipment on my truck it is wired directly into the main dash harness. Here's a picture of the switch and its bracket, the flasher and its bracket which is attached to the switch bracket in the upper right and the bulb, socket and short wiring for the indicator. The 4 black wiring connectors on the flasher, switch and indicator bulb (2 wires) are not part of a separate harness but are jacked into the main harness.



I removed the indicator bulb socket and it's short wiring and set it with the spring and dash bezel with red center. This complete setup in this picture is know as an assembly and anytime you see that in a parts description you know it likely consists of more than one piece.

C3TZ-10A934-A - Emergency Warning Lamp Indicator Assembly



As I cleaned up the orange wire the tag I could tell was one of those original FoMoCo flags



And on the other side it had (most of) the Engineering ID number

C3TB-10A934-A



Notice how the switch is on a plug that is removable, too, unlike the separate harness in the first picture at the top.

C6TZ-13A350-A - Emergency Warning Switch Assembly



And the Flasher is at least an original style like this NOS one.

C0AF-13350-A - Flasher (Tung Sol 536 Heavy Duty)



Chad

.

 

I was at a swap meet a couple of months ago and someone there was selling a good number of NOS Ford parts so I was picking through his stuff and came across these. The fella wouldn't sell me just one envelope of 5 so I bought all 9 envelopes that he had for a total of 45 of these little jewels. Literally found some jewels at a swap meet. And I don't normally buy myself jewelry...Lol.

C1TF-13586-A - Indicator Light Jewel - High beam indicator

 

One of the goals is to not use many, or preferably any, non-USA or Canadian made parts on this truck.

Here was another find from the same guy at the swap meet. Actually just one of these 2 boxes. The other one I got off of eBay from a guy in Russia that had them for whatever reason. He wanted $9 and no extra for shipping. I'm not sure what it cost him to ship the one box from Russia - they aren't real large - but it couldn't have been cheap, either.

This is the #1895 bulb used for most of the dash lighting and the AM Radio if so equipped, at least. They just list the quantity as being "As Required" (AR)

C3AZ-13466-B Miniature Bulb (1895)



Of course, these are just GE lightbulbs, but good old American made GE bulbs from yesteryear. I had to use the flash to really pick up the detail of the stamping.

 

There seems to be a lot of variation in these trucks. The 4WD vs 2WD is understandable but these minor wiring variations seem completely unwarranted.


I also have the integrated emergency flasher wiring but instead of the large switch holder with the flasher receptacle, mine is just a small standoff with the d shaped punched into it. At first I thought I was missing something, but now I think mine came that way.