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I have a John Deere 1800 monitor that I bought used to put it in a tractor. I fired it up got it going and 10 feet later I got a message saying Saving data. It shut down and I couldn’t start it back up.
It’s in a 8850 with a ATU.
Is there anything I can do to get this thing back running or do I have a dead monitor.
 

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Bad wiring harness? If the switched power wire loses 12V, then it will trigger a shutdown procedure. Any neighbors with Deere tractors? You could try the monitor in their tractors with their harness.
 

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Discussion Starter #3
I did some more digging and it is the harness.
tried on another harness and it fired up.
I also found out that you need two positives and one negative for it to work.
One of the positives goes to the battery the other to the key switch.
 
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