ignition coil ballast resistor

[Bill Goddard]

I have tried to search this question but no results. I have a 12v system on my four-door leatherback. I am trying to choose the proper coil. I have a 12v coil that says it has a resistor built in. The ohm reading across the terminals is 3 ohms. I understand a 6v coil should read 1.5 ohms so I think 3 ohms is right for a 12v coil/ 12v system. This would mean the 12v coil would deliver the same amperage as a 6v coil. Am I right? Thanks for any help Bill Goddard