New Holland T8010 Manual page 1482

Aux #1 Driver is On And No Current Is Sensed, Retract /Lower Coil Open Or
Shorted to Ground
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 C340.
Disconnect connector C340.
Inspect pin 1 and pin 2 in the connector. Clean the connection.
Clean the mating pin and connector.
Visually inspect the harness between C340 and C053 and C058 at the AUX/Hitch/PTO controller.
If no damage, measure across pin 1 and pin 2 at the remote valve side.
The resistance should be in the range of 4 to 8 ohms.
If the resistance is higher than 10 ohms, there is an open circuit in the solenoid coil.
If the resistance is less than 3 ohms, there is a shortage in the solenoid coil.
In either case, replace the solenoid in the 1st remote valve.
If the resistance is within the specified range, replace or repair the harness between C340 and C053 and C058
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 1st remote valve on, there should be about 12 volts at C053 pin 10 and low voltage at C058 pin 1.
If not, replace the remote hydraulic controller.
NOTE: See schematic section 54 on the schematic poster.
Section 55 - Electrical System, Controller - Chapter 3
AUX/HITCH/PTO FAULT CODE 124
55-3-63