I have found some info around here and on Google searches, but not much. Mine is open station so I don't have the cab ground strap. I have also cleaned the battery ground wire mounting to the frame to no avail. The Err73 has been on my 2012 4520 for many years dating back with the previous owner. He said no big deal when he sold it to me. Of course.
Anyone have success with fixing this code? It says 'Starter output is shorted to battery or open circuit' and to follow troubleshooting procedures. What are they?
I could bump these few threads I found, but thought I'd start a new one consolidating all I could find.
John Deere 4x20 Fault Codes
4720 Error Code Err 73 ?
Err 73 on new 4520
Anyone fix this on their open station?