New Holland T8010 Manual page 1465

Diff Lock Solenoid High Side Driver is Commanded On But No Current Was
Sensed
Possible failure modes:
1. Valve solenoid coil failed.
2. Damaged wiring.
3. Loose connector or bent pin.
4. Controller internal failure.
Solution:
Check the valve solenoid resistance and the wiring from the AUX/Hitch/PTO controller to the valve solenoid.
1. Test the resistance of the valve solenoid at the valve connector C158.
Disconnect connector C158.
Inspect pin 1 and pin 2 in the connector. Clean the connection.
Clean the mating pin and connector.
Visually inspect the harness between C158 and C054 at the AUX/Hitch/PTO controller.
Check for continuity to ground from C158 harness end pin 2. If no continuity repair ground connection.
If no damage and continuity to ground is good, measure across pin 1 and pin 2 at the Diff Lock valve side.
The resistance should be in the range of 6 to 13 ohms.
If the resistance is higher than 13 ohms, there is an open circuit in the solenoid coil.
If the resistance is less than 6 ohms, there is a shortage in the solenoid coil.
In either case, replace the solenoid on Diff Lock valve.
If the resistance is within the specified range, replace or repair the harness between C158 and C054 at the
AUX/Hitch/PTO controller.
NOTE: Always inspect connector ends for damage, bent or dislocated pins when troubleshooting.
2. Check the function of the AUX/Hitch/PTO controller.
Connect all connections. Make sure the controller has proper power and ground connection.
Turn the Diff Lock valve ON, there should be about 12 volts at C054 pin 9.
If not, replace the AUX/Hitch/PTO controller.
NOTE: See schematic section 49 and 50 on the schematic poster.
Section 55 - Electrical System, Controller - Chapter 3
AUX/HITCH/PTO FAULT CODE 82
55-3-46