POSSIBLE PROBLEMS
1.
Are batteries serviceable?
KNOWN INFO
Circuit breaker CB70 OK.
TEST OPTIONS
NO
YES
Faulty battery(ies).
Faulty cab to chassis ground
strap.
Faulty PDP to cab ground cable.
Faulty dashboard cable assembly.
Faulty shunt.
Faulty starter to shunt 24 VDC
cable.
Faulty battery to shunt cable
assembly.
Faulty starter to chassis ground
cable.
Faulty 100 AMP reverse polarity
relay.
Faulty battery to 100 AMP
reverse polarity relay 12 VDC
cable.
Faulty 100 AMP reverse polarity
relay to PDP 12 VDC cable.
Faulty 200 AMP reverse polarity
relay.
Faulty 200 AMP terminal block.
Faulty 200 AMP terminal block
to PDP 12 VDC cable.
Faulty 200 AMP terminal block
to reverse polarity relay 12 VDC
load cable.
Faulty 200 AMP terminal block
to reverse polarity relay 12 VDC
battery cable.
Faulty battery to 200 AMP
terminal block 12 VDC cable
assembly.
Battery Specific Gravity Test
REASON FOR QUESTION
If battery(ies) is unserviceable,
12 vdc circuits will not operate.
START
WARNING
Read WARNING
on following page.
Charge battery(ies)
(TM 9-6140-200-14) or
replace battery(ies) (para 7-46).
e3. 12 VDC AND 24 VDC CIRCUITS DO NOT OPERATE
TM 9-2320-365-20-1
2-254 Change 1
NOTE
Perform Electrical System Troubleshooting
e1. Circuit Breaker Does Not Operate on
circuit breaker CB70 prior to beginning this
task.
INITIAL SETUP
Equipment Conditions
Engine shut down (TM 9-2320-365-10).
Materials/Parts
Dispenser, Pressure Sensitive Adhesive Tape
(Item 21, Appendix D)
Lockwasher (Item 66.1, Appendix G)
Lockwasher (Item 73, Appendix G)
Lockwasher (Item 76, Appendix G)
Lockwasher (Item 78, Appendix G)
Lockwasher (4) (Item 92, Appendix G)
Lockwasher (2) (Item 65, Appendix G)
Self-locking Nut (Item 148, Appendix G)
Ties, Cable, Plastic (Item 76 Appendix D)
Wire, Elect, 50 ft (Item 77, Appendix D)
Personnel Required
(2)
Tools and Special Tools
Tool Kit, Genl Mech (Item 44, Appendix C)
STE/ICE-R (Item 39, Appendix C)
Multimeter, Digital (Item 22, Appendix C)
Apron, Rubber (Item 3, Appendix C)
Goggles, Industrial (Item 15, Appendix C)
Gloves, Rubber (Item 13, Appendix C)
Socket Set, Socket Wrench (Item 35, Appendix C)
Tester, Antifreeze and Battery (Item 41, Appendix C)
Wire, Relay Test (Item 9, Appendix E)
Wrench, Torque, 0-175 lb-ft. (Item 57, Appendix C)
Wrench, Torque, 0-200 lb-in. (Item 58, Appendix C)
References
TM 9-6140-200-14
TM 9-4910-571-12&P
