OEM key shape and Ignition Switch

Nate, thanks so much ! I always love to see naked pictures of mechanical things , and the find at my next door (to the car, not me) Texas shop is terrific--even the Alfa guys don't seem to carry the part (and amazing that even at Re-originals there is no attribution to whatever car it would go on…).

  Steve, believe it or not I went to work humming to ZZ Top's Blue Jean blues, '..if I ever get back my pickle jar, Lord, how happy could one man be...." But fyi, the "15/54" seems to be the designation for the terminal...Here from the original schematic;

[update November 2022; The numbers in the schematic are DIN 72552 references, https://en.wikipedia.org/wiki/DIN_72552 . The "INT" designator isn't defined, but probably means "Ignition" and provides a dedicated contact for the Coil...At least, preserving an isolated contact to keep the car running is probably a smart choice. Otherwise, its pretty simple; Terminal 30 is the input from the battery/alternator, 50 is to the starter solenoid, and everything else is connected in Run.  Older switches and older definition distinguished a "16" terminal instead of the "15" terminal, either function as the hot wire to the coil and seem to do the same thing as the INT terminal.   The 15/54 essentially means "everything, both #15 class circuits (ignition) and #54 (kitchen sink of lights or whatever).

Nate clued me in a long time ago, Italian motorcycles had nearly the same switch, but (maybe except for Moto Guzzi) no "start" position (only 2 positions). Those switches are the Q149 series.]

Now, what does " Avviam" mean ? Lee

According to my translator commutatore accensione avviam is "ignition switch start".

Think here is the answer, the "F" code key used for the 3 position Q148C Magneti Marelli switch. The key code is on the cylinder front.

Ok, my (ex race car) has lost the whole key assembly, ran off a safety toggle only.

car now painted and need to get some parts to start fitting up as stock street car.  I have a (poor) copy of the Fiat Switch  but it’s only a 3 position (off, on and start) so no accessory.  

question is did the original switch have 4 positions including an accessory function?

(Steve have noted your comments re positioning the hot love at top!)

cheers

Larry

Larry, the Mangusta is a simple 3 position (off, run, start Magneti Marelli Q148C) switch. I thought that maybe Fiat 600 added the accessory position (the 4th position), but I think its likely that any transition to the accessory position happened only in the mid 70's and so then were probably ALL attached to steering column mechanical locks...At least, both Fiat 124 up to 1974 and Fiat 850 1972 were still 3 position only. The Goose accessories are mostly wired to operate all the time (and well, that means the window motors…but oddly, not the courtesy lamps in the front trunk and engine compartment, so as I can tell the ignition had to be ON for these to be used, and my experience was that leaving the ignition ON and motor stopped makes smoke if the points are closed.

  The Q161 seems to replace the Q148, I cannot really see a difference (and even, association to the "G" key isn't clear..

A couple choices that appear to be right (one clearly the “F” key, the other may be…Lee
https://www.ebay.com/itm/174899704956

https://www.ebay.com/itm/274104172630

Thanks Lee, great info and help as ever

cheers