Remove the wire from the coil -ve that goes to the module and connect a voltmeter between that wire and ground and turn the distributor. You should see the voltage switch from 0 volts to 12 volts if the module is working.
I have no experience with Pertronix but assuming that it functions similarly to a 123ignition distributor:
+12V goes to the hot side of the module (probably red wire) and to the ballast resistor.
Coil positive goes to the other side of the ballast resistor.
The low side of the module (probably black wire) goes to coil negative.
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