Barracuda not starting after being parked for five years

phf said
So, I finished my adulting stuff early, and went to check over the connections. The ECU had a bunch of corrosion under it. Cleaned it up and she fired right up!

Thank you all for your input. This is great stuff to keep in mind for the next project I get, or when this one decides to not run again.

Something to think about... "Run" circuit is through ignition switch & has been known to deliver low voltage to ECU as switch ages/corrodes. If you use run circuit to trigger a small relay instead, between battery & ECU, it delivers full battery voltage and better spark. I have that on my 64 Dart using a home built electronic ignition. Ford style coil with GM module and common automotive relay in lower left. Not sure why ballast resistor would be on needed with electronic ignition.