New Holland T8010 Manual page 1535

BOC switch open circuit or Neutral relay stuck open
Cause:
Fault code 37 is recorded when the clutch pedal position is above 30%, shuttle lever is in Forward or Reverse, and
the controller does not detect +12V from bottom of clutch relay.
Possible failure mode:
1. Neutral relay failure
2. Bottom of clutch switch failed open
3. No power supply to the Neutral Relay
4. Wiring or connections to the Neutral relay or BOC switch failed
Solution:
1. The power supply to the Neutral relay (relay #6) and Park brake relay (relay #5) is from fuse #43. If fault code
52 comes with this fault code and the Park Brake will not release when shifted to Forward or Reverse, check
fuse #43.
If fuse #43 is not blown, check wiring between the fuse and the relays.
2. If this fault code comes without fault code 52, replace the relay with a known good relay. If the fault goes away,
it was a relay failure. Otherwise go to next step.
3. Unplug the Neutral relay. Turn tractor Key on. Check power and ground to the Neutral relay.
There should be constant 12 V to cavity 3. If the 12 V is not present, check from the cavity back to fuse #43.
There should be constant 12 V to cavity 1 when the clutch pedal position is above 30% and the shuttle lever is
in Forward OR Reverse. The 12 V should disappear when the clutch pedal position is fully depressed or the
shuttle lever is in Neutral OR Park. If the 12 V is not present, go to step 4.
There should continuity between cavity 2 and ground. If not, check the wiring from cavity 2 to the ground.
If above checks are all ok, check the continuity between cavity 5 and pin 25 or pin 34 of connector 355. If there
is no continuity, check the wiring in between.
4. Check the BOC switch and its wiring.
The BOC switch is located under the steering column. Disconnect connector C50. Measure continuity between
Pin A and B on the switch. With inching pedal up, there should be continuity. With inching pedal down, there
should be no continuity. If the switch works OK, check the wiring between the BOC switch and the cavity 1 of
neutral relay.
Pay attention to loose wire or loose terminal to the relay seat.
If there is not a new relay ready available, swap the Neutral relay with other relays for the checks.
Section 55 - Electrical System, Controller - Chapter 4
FAULT CODE TRANS 37
55-4-8