C15A Wireless Signal Buzzer

[Jordan Baker]

Nothing was left on my truck. This came from a friends truck. He said you could see on the sheet metal where another was supposed to be punched beneath the wood block but hadn't been. From what I can remember on his truck I didn't see any remains of the wiring for this switch.

Did you have any remains of the wiring available for a picture?

Also, you made mention of a lanyard in the rear box used to activate the buzzer. Any pictures of this?

[David Dunlop]

Jordan. I think I have photos of the lanyard setup filed away somewhere, and possibly some of the conductor route through the 2K1 box and chassis/cab assemblies. May take a bit of searching.

The only thing I do not know for certain, is exactly where in the buzzer wiring the power feed fitted into the scheme of things. It is a single, two conductor shielded cable that exits the switch assembly connected to the lanyard and disappearing into the wall conduit of the 2K1 box. it is also a similar cable crossing from underneath the front of the box to under the left front corner of the cab and up the cab wall corner to the two bottom terminals of that particular model buzzer. Somewhere under the front of the 2K1 box, that signal buzzer line has to have a 'Y' in it to pick up the necessary power feed. My suspicion is that this feed feeds from the rear chassis wiring harness in some manner. Never seen the setup to actually understand it,

Which makes for an interesting side topic. Has anyone ever run across a Chevrolet 15-cwt rear chassis wiring harness with a connection fitting near the cab end of it that does not make sense, in that they cannot figure out what it supposed to tie into it? Maybe it could be for this signal buzzer setup and maybe it was used with the installation for your box as well, Jordan.


David

[Jordan Baker]

I found the following in the parts manual for the C15a.

[Jordan Baker]

Also found this listing for cable clamps. Any sign of these or mounting points on the cab floor?

[r.morrison]

David.....as soon as I saw the "guts" of the signal unit, I knew I'd seen that before. If I'm not mistaken, those units were used inexpensive "doorbells" when I was a kid. It was a standard within the household of post war housing here in Canada. Unless you had a little extra cash and could afford the elaborate "chime"s that decorated your living room and impress your neighbours. Robert

[David Dunlop]

Robert. I can remember those buzzers being used in Science classes at school in the 1950's, along with the big, tall, round 1.5V Telephone Dry Cell batteries made by Union Carbide and Northern Electric. Some of the batteries had brass posts with screw fasteners and others had the Fhanstock spring clip terminals.

David

[Grant Bowker]

A modern similar product from the original supplier, Edwards Signalling.
https://www.edwards-signals.com/file...talog_Page.pdf
It is rated for 6VDC operation as well as AC. (Sorry, no 12 V seen on their website - an argument against converting trucks to 12V?) Model 725 are on ebay as low as $9US.

On edit: it looks as if at least two different buzzers were used.

[David Dunlop]

Jordan. Neither of those cables show up in the August 1942 Chevrolet CMP Master Parts List. My Wire 5 was a June 13, 1944 build with the 2K1 Box.

Be great if we had production time frames for the various CMP bodies to cross reference with.

As for the clips, for certain there was at least one holding the cable on its way up the left corner of the cab. I think it was close to the midseam where the roof attached. Will see what the photos might have to say about that, when I find them.

David