I hooked up the small red and green wires back to the irrigation pump relay and made sure they were tight. What I found was the the small green wire had come loose from years of vibrating and once I reconnected it ran like a charm! A savings of $140!
So before you go buy a replacement relay switch, check to make sure the wires are tight first!
If are you buying a replacement, consider the orbit 57009 sprinkler pump relay for $36! A lot less expensive than the ACI!