New Holland CX720 Repair Manual page 1460

N° Test Point
2 Ignition ON.
Check for 12 volts at CCM-2 Power
Relay (pin 1).
3 At CCM-2 Power Relay, ground (pin
2) and check for 12 volts at CCM-2
Power Relay (pin 5).
4 Ignition OFF.
Check resistance of circuit 106 (BK)
between CCM-2 Power Relay (pin 2)
and CCM-3 Cab Power Relay (pin
2).
Fuse and relay box CCM3 relay - Testing (A.50.A.80.73 - G.40.A.20)
NOTE: The batteries must be fully charged and all connections clean and tight. Use a multimeter (DVOM) 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
Test Point
N°
1 Check for 12 volts at CCM-3 Cab
Power Relay (pin 3).
2 Ignition in the "ON" position.
Check for 12 volts at CCM-3 Cab
Power Relay (pin 1).
3 At CCM-3 Cab Power Relay, ground
(pin 2) and check for 12 volts at
CCM-3 Cab Power Relay (pin 5).
4 At CCM-1, ground (pin J1-23) and
check for 12 volts at CCM-3 Cab
Power Relay (pin 5).
Fuse and relay box Auxilary relay - Testing (A.50.A.80.61 - G.40.A.20)
NOTE: The batteries must be fully charged and all connections clean and tight. Use a multimeter (DVOM) for these
tests.
DISTRIBUTION SYSTEMS - ELECTRONIC SYSTEM
Expected Result
12 volts.
If good reading, continue with next
step.
12 volts.
If good reading, CCM-2 Power Relay
is operating properly.
Continue with next step.
Less than 1 ohm resistance.
If good reading, relay is operating
properly. See Service Manual for
testing of CCM-1.
CAUTION
WARNING
Expected Result
12 volts.
If good reading, continue with next
step.
12 volts.
If good reading, continue with next
step.
12 volts.
If good reading, CCM-3 cab power
relay is operating properly.
If good reading continue with next
step.
12 volts
If good reading, see Service Manual
for testing of CCM-1.
A.50.A / 66
2 4/7/2006
Other Result (Possible Cause)
Open circuit 103 (OR), 95 (OR) or
96 (OR) between Ignition Switch
Connector X068 (pin 6) and CCM-2
Power Relay (pin 1).
12 volts not available from Ignition
Switch Connector X068 (pin 6), refer
to Ignition Switch test on page 244.
Faulty CCM-2 Power Relay.
Open circuit 106 (BK) between
CCM-2 Power Relay (pin 2) and
CCM-3 Cab Power Relay (pin 2).
Other Result (Possible Cause)
Open circuit 10 (RD) between
CCM-3 Cab Power Relay (pin 3)
and Fuse #42.
Blown Fuse #42.
Open circuit 104 (OR), 103 (OR), 95
(OR) or 96 (OR) between Ignition
Switch connector X068 (pin 6) and
CCM-3 Cab Power Relay (pin 1).
12 volts not available from Ignition
Switch connector X068 (pin 6), refer
to Ignition Switch Test on page 244.
Faulty CCM-3 Cab Power Relay.
Short to ground in circuit 7 (RD). A
short to ground will blow Fuse #42.
Open circuit 107 (BK) between
CCM-1 (pin J1-23) and CCM-3 Cab
Power Relay (pin 2).