New Holland T8010 Manual page 1339

Exterior Lighting System Symptom Chart
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.
Exterior Lighting System Diagnostic Tests
NOTE: The batteries must be fully charged and all
connections clean and tight. Use a multimeter
(DVOM) or an unpowered test light 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.
Test point
1 Ignition in Run position.
Headlight switch Off.
Rotary switch Off.
Measure voltage at rotary
switch terminal B1.
2 Measure voltage at rotary
switch connector 12
terminal B2.
3 Measure voltage at work
lamp interlock relay (relay
#4) terminal 4.
4 Rotary switch in second
position.
Measure voltage at rotary
switch connector 12,
terminal W.
5 Rotary switch in third
position.
Measure voltage at rotary
switch connector 12,
terminal W.
Section 55 - Electrical System - Chapter 1
Work Lamp Switch Test
Good Reading
12 volts
If good reading, go to test
point 4.
12 volts
If good reading, repair
open in 789.
12 volts
If good reading, repair
open in 789.
12 volts
If good reading, go to next
test point.
12 volts
If good reading, go to next
test point.
55-1-158
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
m a c h i n e or s t a r t - u p o f p o w e r d r i v e n
equipment.
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
m a c h i n e or s t a r t - u p o f p o w e r d r i v e n
equipment.
Possible Cause of Bad Reading
Open circuit from switched B+.
Go to next test point.
Open circuit from switched B+.
Go to next test point.
Open circuit from switched B+.
Rotary switch
Rotary switch