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Thanks for the input. I started checking after looking at the manual and wiring diagrams and was chking the voltage on the back of the keyswitch and noticed there was some dirt/residue on the keyswitch and while cleaning it and spraying with WD40 and measuring I heard a relay click (which I think was the fuel cutoff relay) and then everything seemed to be normal (ignition came on, tractor started etc.) While in maintenance mode I serviced the tractor, greased, changed oil etc. and so far no indication of the electrical problem. I don't know at this point if it was the keyswitch or another intermittent problem. I suspect the keyswitch as I was fooling with it when things started working again. Ed

870 electrical problem
John Deere Tractors
Replies 3 Post by jdeere

The serial number vs year list that I first saw is in the
JD 870 parts catalog.

870 Model Year
John Deere Tractors
Replies 13 Post by jdeere