New Holland CX720 Repair Manual page 1354

A.
Series 1206 and above
Wiring harness - Electrical schematic frame 39 (A.30.A.88-C.20.E.39)
Beacon Relay - Testing (A.40.A.15.82 - 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 Beacon Light Switch.
Measure for 12 volts at Beacon
Light Relay (pin 5).
2 Measure for 12 volts at Beacon
Light Relay (pin 1).
3 Measure for 12 volts at Beacon
Light Relay (pin 3).
4 Disconnect the Beacon Light Re-
lay. Measure resistance on circuit
160(BK) between Beacon Light Re-
lay (pin 2) and ground.
Beacon Switch - Testing (A.40.A.15.83 - 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.
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, go to next test point.
2 4/7/2006
A.40.A / 38
Other Result (Possible Cause)
Beacon Light Relay.
Adjacent circuits.
Go to next test point.
Open or short to ground in circuit
between Beacon Light Relay (pin
1) and CCM-2 connector X015 (pin
J1-24). See Service Manual for test-
ing of CCM.
Open in circuit 69 (RD) between
Beacon Light Relay (pin 3) and Fuse
#53. Short to ground on circuit 578
(PU) between Beacon Light Relay
(pin 5) and Rear Beacon Light con-
nector X247 (pin A). A short will
cause Fuse #53 to blow.
Open circuit 160 (BK) between Bea-
con Light Relay (pin 2) and ground.