New Holland T8010 Manual page 1328

Audio System Diagnostic Tests
NOTE: The batteries must be fully charged and all connections clean and tight. Use a multimeter (DVOM) for these
tests. For battery testing and service, see the battery section in the service manual.
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.
A - Audio System Power and Ground Supply Test
Test Point
1 Measure resistance
between radio connector
95A, terminal 8 and ground.
2 Measure resistance
between connector 95A,
terminal 8 and connector
13M, terminal U.
3 Measure voltage at radio
connector 95A, terminal 7.
4 Will the dome light
illuminate?
5 Ignition switch in Run
position.
Measure voltage at radio
connector 95A, cavity 4.
6 Measure voltage at
connector 13F, terminal W.
7 Measure voltage at fuse 24
Section 55 - Electrical System - Chapter 1
Good Reading
Less than 1 ohm
If good reading, go to test
point 3.
Less than 1 ohm
If good reading, repair
open in 178C(B) circuit to
ground.
12 volts
If good reading, go to test
point 5.
Yes. Fuse 19 and
connector 13 are okay.
Locate the open in 871B
(R)
12 volts
If good reading, power and
grounds to audio system
are operating properly.
12 volts
If good reading, repair
open in 870C(R) circuit.
12 volts
If good reading, repair
open in 870D(O).
55-1-147
Possible Cause of Bad Reading
Open 178M(B) or 178C(B) circuit.
Continue with next test point.
Open 178M(B) circuit from connector
95A to connector 13M.
Repair open.
Blown fuse #19, or
Open 871A(R) or 871B(R) circuit from
connector 95A, terminal 7 to
unswitched B+.
Check fuse.
Continue with next test point.
Continue with next test point.
Open 870 circuit between radio
connector 95A, terminal 4 and
switched B+.
Continue with next test point.
Open 870D(R) circuit between
connector 95A, terminal 4 and
switched B+.
Continue with next test point.
Open in jump wire 106B(O) to ignition.