Watch out when you check to see if you have a resistance wire. If there is no current flowing through the wire you will still get 12 volts. If you have a wiring diagram of your car it will usually show if the coil wire is resistance or not. I know the one on my 73 camaro is. There are usually 2 connections to the wire on the old point type igntions. One will go to the starter and one directly to the igntion switch. The terminal to the coil will look like it has two wires going to it. The one that goes to the starter is there to give you a full 12 volts when starting the car to give it a hotter spark for starting, it just bypasses the resistance wire.