Charging System; Alternator - Ford LSG 875 Service Manual

4-01 CHARGING
4-01
Part 4 - Charging System
SUBJECT
PAGE
DESCRIPTION AND. OPERATION
Alternator ............. m .. . ..................
4-01
Regulator .. . ... . .. , ..... . . ................ . . 4-03
Application , ......... . . . ..... . .. . . . .......... 4-03
DIAGNOSIS
Normal Charge Indicator Light .. , ... . .. . . ... . , . 4-04
Normal Charge Ammeter
.......... . ... , ...... 4-04
Isolating the Problem ..... , ........
. .. . .... . , . 4-04
TESTING
Battery ..........
. ... . .. . ... . ............... 4-05
Charging System Tests ......... , ............. 4-06
Bench Tests ... . ............................ 4-l
1
SUBJECT
PAGE
REMOVAL AND INSTALLATION
Removal . . .... . .... . ........... , ......
, . . ... 4-13
Installation ......
. ........ . . , .. . . . ....... . ... 4-l 3
DISASSEMBLV AND ASSEMBLY
Disassembly ....... I ................ , ....... 4-I 4
Cleaning and Inspection .... , . . ...
l
...... , . a .. 4-16
Assembly
. . . .. s . a ... . ......... . , ............ 4-17
ADJUSTMENTS
Drive Belt .... . ..... . .. a . . .. . .. . ......... . ... 4-18
Belt Tension
................................ 4-18
DESCRIPTION AND OPERATION
ALTERNATOR
The alternator is belt driven from the engine.
Industrial Engines use either a Motorcraft or
Current is supplied from the alternator-regulator
a Motorola alternator. Most of this section ap-
system to the rotating field of the alternator
through two brushes and two slip rings.
plies to the Motorcraft alternator, because the
Motorola unit is serviced by Motorola.
set value, current is cut off to the warning lamp.
This circuit is not included in the regulator for
The warning lamp control circuit passes current
vehicles equipped with an ammeter rather than
to the warning lamp when the ignition switch is in
the warning lamp.
the Run position and there is no alternator voltage
at terminal S. When the voltage at S rises to a pre-
The alternator produces power in the form of
alternating current. The alternating current is rec-
tified to direct current by six diodes. The alternator
regulator ,automatically adjusts the alternator field
current to. maintain the alternator output voltage
within prescribed limits to correctly charge the
battery. I The alternator is self-current limiting.
WARNING:
MARINE ALTERNATORS ARE EX-
TERNAL IGNITION PROTECTED. WHEN RE-
PAIRING OR REPLACING THESE UNITS, USE
ONLY PARTS OR ASSEMBLIES DESIGNATED
FOR THIS PURPOSE. TO SUBSTITUTE AUTO-
MOTIVE
PARTS OR ASSEMBLIES, WHICH AP-
PEAR SIMILAR AND WILL FUNCTION, VOIDS
THE EXTERNAL IGNITION PROTECTION AND
GREATLY INCREASES THE DANGER OF IGNI-
TING A COMBUSTIBLE MIXTURE, RESULT-
ING IN POSSIBLE PERSONAL INJURY.