Inner Work Light - New Holland CX720 Repair Manual

Inner work light Electrical light - Testing (A.40.A.32.85 - 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 Work
Lights Relay (pin 5).
2 Measure the voltage at Distance
Work Lights Relay (pin 1).
3 Measure for 12 volts at Distance
Work Lights Relay (pin 3).
4 Disconnect the Distance Work Lights
Relay.
Measure the resistance on circuit
155 (BK) between Distance Work
Lights Relay (pin 2) and ground.
Inner work light Electrical light - Testing (A.40.A.32.85 - G.40.A.20)
Test Point
N°
1 Place Ignition Switch in "ON" posi-
tion.
Close Work Light Switch.
Measure for 12 volts at Distance
Work Lights Relay (pin 6).
2 Measure for 12 volts at LH Cab In-
ner Work Lights Relay (pin A).
3 Disconnect the LH Cab Inner Work
Light. Measure the resistance on cir-
cuit 261 (BK) between LH Cab Inner
Work Light connector X115 (pin B)
and ground.
DISTRIBUTION SYSTEMS - LIGHTING SYSTEM
CAUTION
WARNING
Expected Result
12 volts.
If good reading, the relay is operating
properly.
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 Distance
Work Lights Relay.
Expected Result
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
Inner Work Light bulb.
2 4/7/2006
A.40.A / 65
Other Result (Possible Cause)
Distance Work Lights Relay.
Adjacent circuits.
Go to next test point.
Open or short circuit 189 (WH) or
190 (WH) between Distance Work
Lights Relay (pin 1) and CCM-1 (pin
J1-11).
See Service Manual for testing of
CCM.
Open circuit 60 (RD) between Dis-
tance Work Lights Relay (pin 3) and
fuse F-29.
Short to ground on circuit 21 (OR)
between Distance Work Lights Relay
(pin 3) and Work Light Switch con-
nector X132 (pin 5).
A short will cause fuse F-29 to blow.
Open circuit 155 (BK) between Dis-
tance Work Lights Relay (pin 2) and
ground.
Other Result (Possible Cause)
Perform the Work Light Switch Test.
Open circuit 61 (PU) or 255 (PU) be-
tween Work Light Switch connector
X132 (pin 6) and LH Cab Inner Work
Light connector X115 (pin A).
Open circuit 261 (BK) between LH
Cab Inner Work Light connector
X115 (pin B) and ground.