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TM 9-2320-364-20-2
2-1600
Materials/Parts
Tag, Identification (Item 88, Appendix C)
Lockwasher (2) (Item 149, Appendix F)
Lockwasher (28) (Item 171, Appendix F)
Lockwasher (2) (Item 193, Appendix F)
Lockwasher (Item 198, Appendix F)
50. 12 AND 24 VOLT SYSTEMS NOT CHARGING OR UNDER CHARGING (145 AMP).
INITIAL SETUP
1.
Replace or adjust
alternator belts (Para
7-4). Verify repair, go
to Step 14 of this
Fault.
START
NO
YES
Both voltmeters indicate low
charge.
Batteries OK.
Fuel pump operates indicating
24 vdc present at DUVAC
controller IGN terminal.
Alternator belts loose or missing.
DUVAC controller faulty.
Wire 1278 between alternator
positive (+) terminal and
DUVAC (A) terminal faulty.
Wire 1275 from alternator
negative (–) terminal to
battery negative faulty.
Jumperwire from alternator field
coil negative terminal to
alternator negative (–)
terminal faulty.
Alternator faulty.
Wire 1344 between alternator
and regulator faulty.
Wire 1274 between DUVAC
controller and batteries faulty.
Brown wire between DUVAC
controller and regulator faulty.
Wire 1435 between DUVAC
controller and ground faulty.
Black wire between regulator
and ground faulty.
Red wire between DUVAC
controller and regulator faulty.
Orange wire between DUVAC
controller and regulator faulty.
Regulator faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Visual inspection.
If alternator belts are loose or
missing, alternator will not
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)
Gage, Belt Tension (Item 26, Appendix G)
Multimeter (Item 44, Appendix G)
Jumperwire
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
Are alternator belts properly
installed?
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