My 4 row JD 7000 planter came with seed tube sensors and a harness with a 31 pin connector. I found and bought an older monitor, a John Deere M2000, but it has a 10 pin connector. Inside the 10 pin connector there is a red and black that are a little heavier, presumably the power in and ground, as well as four different colored smaller wires, probably one for each light. But from the planter harness, there are black, red, and green which are heavier, then four different colored smaller wires as I would expect. Need to know what to do with the green. Not really sure how the sensors and monitor work, and can't find a manual for this model on line.