i'd like to know the number of that can coil that has an internal resistor.
that's a pretty rare item.. must be vintage or specialty. :)
modern can coils just have the correct gauge wire and # of turns inthe primary for the native circuit voltage they are designed for. though may have cryptic lettering that states. 12v with external resistor.. meaning it is pretty much a 6v coil. :) or states. 12v, needs no external resistance.