New Holland CX720 Repair Manual page 1308

Alternator - Problem solving (A.30.A.82 - G.40.A.30)
OPERATION
The Alternator (B+) connector X213A is connected to the battery via terminal B+ on the Starter Motor and is grounded
to the engine through connector X213B.
The Alternator is self exciting and does not require an excitation circuit. Charging system output is controlled by an
integral voltage regulator/brush assembly. The regulator is set to 14.2 volt regulation. The Alternator is temperature
compensated so that output will drop as the Alternator warms up.
For vehicles equipped with a 7.5 L engine w/mech governor, the Alternator provides engine RPM information to the
CCM through circuit 421.
Refer to : Wiring harness - Electrical schematic frame 01 (A.30.A.88 - C.20.E.01)
Refer to : Wiring harness - Electrical schematic frame 02 (A.30.A.88 - C.20.E.02)
TROUBLESHOOTING
Before troubleshooting the starting system make sure that the following operating conditions are met:
A. The batteries are fully charged and all connections are clean and tight.
B. Transmission in neutral or park.
C. Check all connectors for full installation, loose, corroded, pushed out, or bent terminals.
NOTE: The batteries must be fully charged and all connections clean and tight. Use a multimeter (DVOM) for these
tests. For battery testing and service, see the battery section in the service manual.
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
Problem
System not charging or
charging poorly. Battery
goes dead.
System overcharging
DISTRIBUTION SYSTEMS - ELECTRICAL POWER SYSTEM
Possible Cause
Alternator belt
B+ circuit
Alternator
Alternator
CAUTION
CAUTION
See engine repair section of Service Man-
ual to replace or adjust belt.
A - Charging System Output Test, test
points 2-4.Alternator - Testing (A.30.A.82
- G.40.A.20).
A - Charging System Output Test, test
points 4-6.Alternator - Testing (A.30.A.82
- G.40.A.20).
A - Charging System Output Test, test
points 2-4.Alternator - Testing (A.30.A.82
- G.40.A.20).
2 4/7/2006
A.30.A / 1128
Correction