New Holland T8010 Manual page 1324

Diagnostic Tests
NOTE: The batteries must be fully charged and all connections clean and tight. Use a multimeter (DVOM) for these
tests.
IMPORTANT: DO NOT use a self-powered test light for any of these tests. Use of a self-powered test light can
cause damage to components in this system.
WARNING: Before performing any of the electrical tests, be sure all operating controls are in neutral or
!
park lock position. This will eliminate accidental movement of the machine or start-up of power driven
equipment.
Test Point
1 Check for 12 volts at cab
power relay terminal 240.
2 Ignition ON.
Check for 12 volts at cab
power relay terminal 239.
3 Check for chassis ground
at cab power relay terminal
279.
4 Check for 12 volts at cab
power relay terminal 138.
Section 55 - Electrical System - Chapter 1
A - Cab Power 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.
If good reading continue
with next step.
12 volts
If good reading, cab power
relay is operating properly.
55-1-143
Possible Cause of Bad Reading
Open circuit 101A(R).
Open 105A(R), diode 266, or 104A(R)
circuit between ignition switch connector
161 terminal 5 and cab power relay
terminal 239, or
12 volts not available from terminal 5 of
ignition switch connector 161. Refer to
ignition switch test.
Open 177J(B) circuit from cab power
relay terminal 279 to ground.
Faulty cab power relay.