New Holland T8010 Manual page 1519

Both PTO On And Off Switches Are Simultaneously On, One of the PTO
Switches Is Shorted To 12 Volts
Cause:
The PTO switches in armrest are both simultaneously on, one switch may be shorted to 12 volts. The PTO switch
in armrest is hard wired to AUX/Hitch/PTO controller.
Possible failure mode:
1. The PTO on/off switch failed in the armrest controller (in most cases).
2. PTO switch wiring shorted to power between the AUX/Hitch/PTO controller and the armrest controller (fair
chance).
3. Software execution error in the armrest controller (small chance).
Background:
The PTO off/on switch is hard wired to the armrest controller and the AUX/Hitch/PTO controller.
Solution:
The PTO on/off switch is hard wired in the armrest controller and is hard wired to the AUX/Hitch/PTO controller.
1. Connect the service tool to the tractor Data Bus, do the following:
Go to the Monitor screen by click the Monitor Icon.
Click the CHANGE PARAMETER SELECTIONS Icon.
Click the PTO SWITCH and then ADD. Next click EXIT. You will now be able to monitor the PTO SWITCH
status on the screen.
Turn the switch on and off, and watch the status change.
If the status display matches the switch changes, the switch is working OK. If not, continue the test procedures.
If the service tool is not connected to the tractor Data Bus or the status display does not match the switch
changes, test the switch and its wiring. See step 2.
2. Check for a short to power in main harness at connector C137 pin 7 to ground. If 12 volts is present disconnect
connector C010. If the 12 volts disappears the short is between connector C010 and the AUX/Hitch/PTO
controller connector C057 pin 30. If the 12 volt reading persists the short is in cab harness between connector
C010 and C157.
NOTE: See schematic sections 47, 49 and 50 on the schematic poster.
Section 55 - Electrical System, Controller - Chapter 3
AUX/HITCH/PTO FAULT CODE 170
55-3-100