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TM 9-2330-385-14
4-14. 12-VOLT ELECTRICAL SYSTEM TROUBLESHOOTING PROCEDURES (CONT).
16. ALL LIGHTS ON REAR OF TRAILER DO NOT OPERATE
(S/N YB6122 075 AND UP).
INITIAL SETUP
References
Tools and Special Tools
TM 9-2320-364-10
Tool Kit, General Mechanic's: Automotive
(Item 50, Appendix J)
Equipment Condition
Multimeter (Item 28, Appendix J)
Engine OFF, (TM 9-2320-364-10)
Wheels chocked, (TM 9-2320-364-10)
Personnel Required
Parking brake applied, (TM 9-2320-364-10)
Two
12 vdc cable assembly connected to truck,
NOTE
All electrical wires and components listed in this troubleshooting procedure are illustrated and located in FO-1.1.
START
1.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Truck electrical system OK.
Continuity test.
Front side marker lights operate.
REASON FOR QUESTION
POSSIBLE PROBLEMS
Is continuity measured on wire
If continuity is not measured
Wire 1435 faulty.
1435 between rear junction
rear junction box terminal wire
box and a known good
1435 and a known good
ground, wire 1435 is faulty and
ground?
all lights on rear of trailer will
not operate.
Repair wire 1435
(see schematic,
Fig FO-3) or replace
NO
trailer main wire
harness (Para 4-30).
Verify repair, go to
Step 2 of this Fault.
YES

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