Mark, The answer to my question is the current in a 6v coil can be anywhere from 3 to 6 amps. Which means the ballast resistance should match the coil's resistance if you want to have 6v applied to a 6v coil and 6v to the ballast. People guessing at the ballast resistor and not measuring the voltage and amps, will complain they don't make points like they used too.
The current in a coil will increase when the alternator kicks in. 12v can be over 14 volts. That will also be responsible for points burning out faster.
I would like to see an ohmmeter, a YT member owns, that can measure the exact resistance of a ballast and the resistance of a coil accurately to 1/100 of an ohm. I'll settle for 1/10 of an ohm accuracy. I don't have any such meter. I have to settle for measuring volts and amps.
BTW, I had to make 14g leads to accurately measure amps. The hair-like leads on my cheapie HF meters had enough resistance to mess with the current and voltage distribution.
The answer to my question is, there is no standard primary current.
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