TFI module then or its wires
Go here: Ford EEC-IV/TFI-IV Electronic Engine Control Troubleshooting
print the worksheet and do the voltage OHMs test
TFI module gets pulse from sensor in the distributor, Module then pulses Coil(grounds it) to generate spark.
Coils get 12v when key is on, the Ground(-) is what pulses on and off to cause the coil to spark, has always been that way, the old points setup in a distributor was the Ground for the coil, opened and closed to ground and unground the coil.