Zen and the art of electronic ignition

1...You may have fallen into the "usual trap." No starting 12V. You must make sure the brown wire (original) is hooked to the coil side of the ballast to provide cranking 12V

2...If no results test the system by hot wiring it----hook a jumper wire to provide 12V direct to coil. Don't do this more than necessary

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Make SURE the ECU is grounded!!!

With power to the system, you can test it without the distributor connected by tapping the bare side of the distributor harness connector to ground. This should generate one spark each time

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Your possibilities as it seems to me:

1...New ECU not grounded

2...You somehow got a 5 pin ECU which requires a 4 pin resistor

3...The ECU harness connector is flakey, or other wiring is flakey.......distributor connectors are notorious

4....Of course the ECU could actually be defective out of the box