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TM 9-2330-385-14
4-14. 12-VOLT ELECTRICAL SYSTEM TROUBLESHOOTING PROCEDURES (CONT).
7. TAILLIGHT AND STOPLIGHT DO NOT OPERATE.
INITIAL SETUP
Tools and Special Tools
References
Tool Kit, General Mechanic's: Automotive
TM 9-2320-364-10
(Item 50, Appendix J)
Equipment Condition
Multimeter (Item 28, Appendix J)
Engine OFF, (TM 9-2320-364-10)
12 vdc cable assembly connected to truck,
Personnel Required
Two
Parking brake applied, (TM 9-2320-364-10)
Wheels chocked, (TM 9-2320-364-10)
NOTE
The following troubleshooting procedures cover the left taillight and stoplight.
D
All electrical wires and components listed in this troubleshooting procedure are illustrated and located in FO-1.
D
START
1.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Truck electrical system OK.
Continuity test.
All other trailer lights operate.
REASON FOR QUESTION
POSSIBLE PROBLEMS
Is continuity measured on
If continuity is not measured at
wire 1435-25 and a known
Wire 1435-25 faulty.
wire 1435-25 connector,
good ground?
Composite light faulty.
composite light ground is faulty
or if there is continuity on wire
1435-25, composite light is faulty
and lights will not operate.
Repair wire 1435-25
(see schematic, Fig
FO-1) or replace side
NO
composite light
harness (Para 4-30).
Verify repair, go to
Step 2 of this Fault.
YES
Replace rear
composite light
Verify repair, go to
Step 2 of this
Fault.

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