Tim,
I don't know the details of what you are doing so this might be all smoke! If you are using two carburetors, I have often read that only one needs to be equipped with a operating choke!
From your post, I assume replacing the coil wire with a heavier gauge would be a major task...it's probably inside a nice OEM loom or something.
The ignition (coil) is about the only thing switched by the key in the engine compartment. I'm not sure what would happen if you attached your choke wire to the ARM terminal of the voltage regulator...this wouldn't be powered until the generator started to output, a 'faux switch'.
My bet is you don't have a generator! probably replaced it with a nice 6 volt alternator.
Are you sure your coil wire is 18 gauge...that is pretty small for any device. The books says it's only good for 3 amps. I don't know what your choke coil draws. 16 gauge is good for 6 amps, which I would think might be more of a standard gauge for the smallest wire under the hood! That's my two cents, good luck.
Stuart
