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TM 9-2330-385-14
4-14. 12-VOLT ELECTRICAL SYSTEM TROUBLESHOOTING PROCEDURES (CONT).
4. TAILLIGHT(S) 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
Materials/Parts
Locknut (Item 31, Appendix I)
truck, (Para 2-9)
Packing, Preformed (Item 59, Appendix I)
Parking brake applied, (TM 9-2320-364-10)
Wheels chocked, (TM 9-2320-364-10)
Personnel Required
Two
NOTE
The following troubleshooting procedures cover the left taillight, but they apply to both taillights.
D
All electrical wires and components listed in this troubleshooting procedure are illustrated and located in FO-1.
D
Trailer may be equipped with composite lights or LED composite lights.
D
START
1.
KNOWN INFO
TEST OPTIONS
Truck electrical system OK.
Visual inspection.
Does at least one taillight
operate when power is
REASON FOR QUESTION
applied?
POSSIBLE PROBLEMS
If no taillights operate when pow-
er is applied, fault is in the 12
Light lamp faulty.
vdc cable assembly through rear
Composite light faulty.
junction box assembly. If at
Wire 1008/21-29 faulty.
least one taillight operates, fault
12 vdc cable assembly faulty.
is between wire 1008/21-29 and
Connector MC16 faulty.
light lamp.
Front junction box assembly
faulty.
Wire 1008-20 faulty.
Rear junction box assembly
faulty.
Go to Step 7 of this
NO
LED composite light ground
Fault.
wire pigtail faulty.
LED composite light faulty.
If composite lights are
installed, go to Step 2
of this Fault.
YES
If LED composite
lights are installed, go
to Step 4.1 of this
Fault.

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