Having issues with either the wire harness or the console itself.  Sometimes at random when I turn the console on, it will display "Row Sensor 20 Failed".  Also, when planting, Row 20 will randomly show "Row Failed", Hi, or Lo Population warnings. Today it even thought I was planting corn at 312,000 population. Switched seed tubes/sensors and it stays with Row 20, not the sensor.  Put dielectric grease on terminals in weatherpak connector on seed sensor, and also on amp connector at the tractor hookup.  How can I further troubleshoot?