Wiring questions for coil and alternator harness

I just did this recently on a 68 Polara. Used a Pertronix ready to fail module. With the stock coil.
You need to find out if the coil you are using normally uses a Bal Res. If it does, then the BR should be used unless you want to burn out the coil. The Pert requires the FULL 12v [ no BR ], which complicates the wiring. The only way I could see of doing it with the Mopar system was to use a relay or diode; I used the rel.