Looking for advice or a manual. I am adding a John Deere Computer Track 250 planter monitor to a old 7000 planter. Planter will be pulled with a 4020. How do I determine which pin in the power cable is positive, negative, and ground it is a 3 pin plug? I don't have a tractor that has the plug built into it.
John Deere Computer Track 250 planter monitor
