Middle Work Light - New Holland CX720 Repair Manual

Middle work light Electrical light - Testing (A.40.A.33.85 - G.40.A.20)
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.
DO NOT use a self-powered test light for any of these tests. Use of a self-powered light can cause damage
to components in this system. M979
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. M980
N° Test Point
1 Place Ignition Switch in "ON" posi-
tion.
Close Work Light Switch.
Measure for 12 volts at Cab Roof
Work Lights Relay (pin 87).
2 Measure for 12 volts at Fuse #6,
circuit 23 (OR).
3 Measure for 12 volts at LH Cab Mid
Work Light connector X114 (pin A).
4 Disconnect the LH Cab Mid Work
Light.
Measure the resistance on circuit
260 (BK) between LH Cab Mid Work
Light connector X114 (pin B) and
ground.
Middle work light Electrical light - Testing (A.40.A.33.85 - G.40.A.20)
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.
DO NOT use a self-powered test light for any of these tests. Use of a self-powered light can cause damage
to components in this system. M979
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. M980
N° Test Point
1 Place Ignition Switch in "ON" posi-
tion.
Close Work Light Switch.
Measure for 12 volts at Cab Roof
Work Lights Relay (pin 87).
DISTRIBUTION SYSTEMS - LIGHTING SYSTEM
CAUTION
WARNING
Expected Result
12 volts.
If good reading, go to next test point.
12 volts.
If good reading, go to next test point.
12 volts.
If good reading, go to next test point.
Less than 1 ohm.
If good reading, replace the LH Cab
Mid Work Light bulb.
CAUTION
WARNING
Expected Result
12 volts.
If good reading, go to next test point.
2 4/7/2006
A.40.A / 67
Other Result (Possible Cause)
Perform Cab Roof Work Lights Relay
Test. (Refer to Work light Switch -
Testing (A.40.A.30.83 - G.40.A.20).
Open circuit 23 (OR) between Fuse
#6 and Cab Roof Work Lights Relay
(pin 87).
Fuse F-6, Open circuit 58 (PU) or
252 (PU) between fuse F-6 and LH
Cab Mid Work Light connector X114
(pin A).
Open circuit 260 (BK) between LH
Cab Mid Work Light connector X114
(pin B) and ground.
Other Result (Possible Cause)
Perform Cab Roof Work Lights Relay
Test. (Refer to Work light Switch -
Testing (A.40.A.30.83 - G.40.A.20).