Ignition 1 should go to the resistor and then to the coil +.
On a key start truck (V8)Ign 2 should go directly to the coil + to bypass the resistor to give a hotter spark at startup. A six cylinder with foot start had the resistor bypass done by a wire that ran from the switch on the starter up to the coil.
There is very little differance in a 6V and a 12V coil.
A 6v car when charging runs at 7.2 volts to the coil. A 12v car with a dropping resistor puts about 8-9 volts to the coil. Very close to the same.
I have customers running 6v coils with a resistor on 12v cars with no problems.
