Quantcast ALL TRAILER LIGHTS DO NOT OPERATE (S/N YB6122 075 AND UP). -725550490

 

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ALL MARKER LIGHTS DO NOT OPERATE (S/N YB6122 075 AND UP). (Cont) -725550489
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TM-9-2330-385-14 Palletized Load System Trailer (PLST) Model M1076 Manual
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ALL TRAILER LIGHTS DO NOT OPERATE (S/N YB6122 075 AND UP). (Cont) -725550491
TM 9-2330-385-14
4-14. 12-VOLT ELECTRICAL SYSTEM TROUBLESHOOTING PROCEDURES (CONT).
20. ALL TRAILER LIGHTS 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)
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
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
Continuity test.
Truck electrical system OK.
REASON FOR QUESTION
POSSIBLE PROBLEMS
Is continuity measured
If continuity is not measured
12 vdc cable faulty.
between 12 vdc cable
between 12 vdc cable, pin A
Wire 1435 faulty.
and a known good ground, 12
connector, pin A and a known
vdc cable is faulty.
good ground?
If continuity is measured, trailer
harness wire 1435 is faulty.
Repair (Para 4-31) or
replace (Para 2-9)12
NO
vdc cable. Verify
repair, go to
Step 2 of this Fault.
YES
Repair wire 1435
(see schematic, Fig
FO-1.1) or replace
trailer main wire
Verify repair go to
Step 2 of this Fault.

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