i just went to put 28 on today and the john deere rate controler tach does not appear on the screen. the error reads "comunication error, check conections"
I checked all the connections and power feeds, voltage is at 13.2 could not find a problem.
it worked perfectly when i put it away in the shed a week ago. i am also running an ag express wireing harness to conect the controler with the gs2 if that is any help.

thanks in advance