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TM 9-2320-364-20-2
2-1632
52. 24 VOLT SYSTEM NOT CHARGING OR UNDER CHARGING (145 AMP).
INITIAL SETUP
1.
Replace voltage
regulator (Para 7-6).
Verify repair, go to
Step 6 of this Fault.
START
YES
NO
24 vdc voltmeter indicates low
charge.
12 vdc voltmeter indicates
proper charge.
Batteries OK.
Fuel pump operates indicating
24 vdc present at DUVAC
controller IGN terminal.
Windshield wipers operate
indicating wires 1281 and
1277 and magnetic switch
R26 are OK.
Voltage regulator faulty (Timer
Section).
Wire 1702 faulty.
Wire 1435 faulty.
24 vdc voltmeter faulty.
DUVAC controller out of
adjustment.
DUVAC controller faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Voltage test.
STE/ICE-R #89.
If voltage regulator does not
shut down the charging system
for 1-2 seconds every 55-60
seconds, charging system will
not reset to the 24 vdc mode
and 24 vdc system will under-
charge.
2-20. ELECTRICAL SYSTEM TROUBLESHOOTING (CONT.)
Tools and Special Tools
Tool Kit, General Mechanic’s: Automotive
(Item 74, Appendix G)
STE/ICE-R (optional) (Item 3, Appendix G)
Multimeter (2) (Item 44, Appendix G)
Equipment Condition
Engine OFF, (TM 9-2320-364-10)
Parking brake applied, (TM 9-2320-364-10)
Wheels chocked, (TM 9-2320-364-10)
References
TM 9-2320-364-10
TM 9-4910-571-12&P
Materials/Parts
Lockwasher (4) (Item 171, Appendix F)
Does voltage regulator shut
down the charging system
for 1-2 seconds every 55-60
seconds?
WARNING
Read WARNING
on Page 2-1633
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