New Holland T8010 Manual page 1325

Test Point
1 Unplug the Controller relay
from the relay base.
Ignition switch in Run.
Check for 12 volts at
controller relay base
terminal A3.
2 Ignition switch in Run or
Acc.
Check for 12 volts at
controller relay base
terminal A2.
3 Check for chassis ground
at relay terminal A1.
NOTE: If all three checks are good, replace relay.
Section 55 - Electrical System - Chapter 1
B - Controller Relay Test
Good Reading
12 volts
If good reading, continue
with next step.
12 volts
If good reading, continue
with next step.
Less than 1 ohm
resistance between
controller relay terminal A1
and chassis ground.
55-1-144
Possible Cause of Bad Reading
Open circuit 163B(R) between controller
relay terminal A3 and switched power
bus.
Open 106C(R) circuit between ignition
switch connector 161 terminal 6 and
controller relay terminal A2.
12 volts not available from terminal 6 of
ignition switch connector 161. Refer to
ignition switch test.
Open 171B circuit from controller relay
terminal A1 to ground.