When I first got my 70 challenger it had a mopar electronic distributor, dual ballast, and an aftermarket 5 prong ECU with all wires hooked up.

It wouldn't start, or even turn over.

I found an open in the neutral safety switch wiring, and when I fixed that it would turn over, but not start.

I replaced the ECU with a new aftermarket 5 prong unit from the local parts store, using the included wiring diagram to check that all the wires went where they were supposed to. (they did) Still the same situation, turned over, but no start.

I checked out some other things, and everything checked OK. Not knowing what else to do at the time, I called Year One tech support at about 10 PM. He told me to cut the green wire and tape it out of the way. I was hesitant, but that's what I did, and after that it worked fine. I still don't understand why though.

Tav