Oops, the "back of the alternator" was there before and didn't mean to post it. The electric choke on my 66 has been wired to the 12v. input side of the ballast for 10 years now without issues.
Yea this is what I'm thinking and how I have my slant choke wired. Connect it to the feed side of the ballast resistor, it's always 12v and switched so that it's on whenever the key is on. No need for a relay imo
