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I have checked the voltage at the connection where the solenoid hooks into the wiring harness. There are three wires. One ground, two hot. When the iginition switch is in the on position one of the hot wire shows 12.46 volts and stays thatway until the switch is turned off. The other hot goes to 12 volts as soon as the ignition switch is turned on, but it goes to zero in about 2 seconds. The two second hot wire should pull the plunger on the solenoid in and the second hot wire holds it in. My information says that it takes 50 amps to pull the plunger in and about 1 to hold it. It must not be getting the entire 12 volts and 50 amps required to pull in the plunger. I also have another problem. The voltage going to the solenoid is intermittent. sometimes it's there and sometimes it's not. Yee Ha!
I'm trying to figure out how to test the relays you guys mentioned and the timer relay for the pull in side.
One good point - the tractor still starts and runs with the solenoid removed if you operatethe fuel lever manually. I'm afraid this negates all the safety switches or I'd rig up a manual kill switch out of a good stiff coathanger.
Thanks for the help. additional suggestions are appreciated.

870 Fuel shut off problem
John Deere Tractors
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