Need help, wiring for points

[lukecp]

This isn't chevy truck related, but....

I am almost done re-wiring my 1952 Ford 8N tractor. The wiring was pretty hacked up by the PO who converted the tractor from 6v to 12v. I need to run a wire from the igniton switch to the coil so it can activate the points.

I hear that points need 6-9 volts to operate correctly, and 12v will burn them up pretty quick. I dont quite know how it was wired before, so it is kinda difficult to re-wire, even with a factory wiring diagram. My coil says "FOR EXTERNAL RESISTOR ONLY". So this means that the voltage going to the + terminal on the coil is supposed to already be 9v, and then the wire from the - terminal on the coil to the dizzy will also be at 9v?

I dunno how the voltage was dropped before. Can i use a internal resistor coil if such thing exists, and just feed a full 12v to the + terminal on the coil? If not, what kind or resistor is needed to drop the voltage to 9v before it is taken to the coil?

Also, the tractor has a Delco alternator which appears to be an internaly regulated model. It has 2 wires coming from it...one from the BATT terminal on the alternator, and another white wire comes out of the plug in terminal on the alternator. I hooked up the BATT wire as it was before, going to the battery cable at the starter solienoid. What does the white wire coming from the plug in terminal do? It was going to the ignition switch originally.

Thanks for any help