Found: URGENTLY - Fan Pulley Ford Lynx 12V Generator

[Lynn Eades]

Tony W. the difference in the field windings has to be the number of windings, and therefore the strength of the magnetic field. How this converts to voltage I am not sure (I remember less than I've forgotten) but my guess is that the stronger the magnetic field the higher the voltage at any given armature speed.
The problem unregulated, is the overheating and melt down. (melting and throwing of the commutator solder? etc.)
With the part number prefix, the C01W the C= Canada production, and the "0" is 1940. The other bits I cant help with.
Ford built a Carrier engine that was a "79E 6004 C.S. I think the 79 refers to a basic engine build. (I dont know)
On that note:
There is a Chilwell publication No. 79/49 titled "Engine Build Up Data" Anyone have a copy?