QUOTE(malcolm2 @ Jan 24 2020, 03:20 PM)
This is what the HOT SPARK folks say the BR is for and how to install etc....
External Ballast Resistor: If the charging system voltage, measured at the coil's + terminal, is more than 14.0 volts at any RPM level, the voltage regulator likely needs replacing or a 1.4 Ohm ballast resistor should be wired between the coil's + terminal and the red HotSpark ignition wire. Too much voltage can damage the ignition module and other electronic components.
Again, this is HOT SPARK. You should check and see if Petronix has similar tests.
Was your question, should I install a BR, or Do you currently have a BR? I thought it was the latter.
Pertronix is the opposite. No ballast resistor. Also, they are best with their flamethrower coil.
"A. Recommended Installation: Many vehicles came equipped with ballast resistor or
resistance wire. To achieve optimum performance from the Ignitor II ignition system, we recommend removal of these components."
Pertronix instructions