JD 9750 STS has a ATU, 2630, and either a StarFire iTc or StarFire 3000 receiver (depends what we are doing). Last fall when we got done with harvest, everything with the auto steer worked just fine. This year when we got the combines out for wheat harvest, the system would never recognize that there was a receiver present. It didn't matter if we put the iTc on or the 3000. Both receivers are good, they work just fine on our other equipment. There is CAN voltage and power voltage through greenstar harness. The only other issue we have had with the system on this combine is it will never record harvest data. It always asks for client, farm, field, task and those all are input correctly. I don't know if these two issues are related or not. Yield and moisture show up on the old greenstar screen but it never totals up. Local dealer is swamped so not sure when a tech will be out to look.