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Page Title: REAR MARKER LIGHT(S) DO NOT OPERATE (S/N YB6122 075 AND UP).
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TM 9-2330-385-14
4-13. 24 VOLT ELECTRICAL SYSTEM TROUBLESHOOTING PROCEDURES (CONT).
14. REAR MARKER LIGHT(S) DO NOT OPERATE (S/N YB6122 075 AND UP).
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)
24 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 one rear marker light, but they apply to all rear marker lights.
D
All electrical wires and components listed in this troubleshooting procedure are illustrated and located in FO-1.1.
D
START
1.
TEST OPTIONS
KNOWN INFO
Visual inspection.
Truck electrical system OK.
Does at least one rear or rear
All other lights on trailer
side marker light operate?
operate.
REASON FOR QUESTION
POSSIBLE PROBLEMS
If no rear or rear side marker
lights operate, fault is in trailer
Wire 1012B faulty.
main wire harness wire 1012B.
Wire 1435 faulty.
If at least one rear or rear side
Rear marker light faulty.
marker light operates, fault is in
rear junction box through rear
marker light.
Repair wire 1012B
(see schematic, Fig
FO-1.1) or replace
trailer main wire
NO
harness (Para
4-30.1). Verify repair,
go to Step 4 of this
Fault.
YES

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