520 coil wiring with a Pertronix

I thought I posted this question a few days ago so my apologies if it is a duplicate...I can't find the other post.

Installing a new Brillman wiring harness in a 520 along with a Pertronix module. The wiring harness has a BROWN wire coming from the MAG/GRND terminal on the ignition switch to the (-) terminal of the coil. There is also a GREEN wire coming from the resister to the (-) terminal of the coil. I don't have the paperwork in front of me but the (+) coil terminal connects to...the ignition switch somewhere I think. The Pertronix module directions appear to say that the GREEN wire needs unhooked & hooked to one of the Pertronix wires while the other Pertronix wire connects to the coil (-) terminal. It doesn't say what to do with the BROWN wire but does say that there should only be two wires total going to the coil. What do I do with the BROWN wire?
 
Original wiring diagram.
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