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TM 9-2330-385-14
4-13. 24-VOLT ELECTRICAL SYSTEM TROUBLESHOOTING (CONT).
20. ALL MARKER 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)
Multimeter (Item 28, Appendix J)
Equipment Condition
Engine OFF, (TM 9-2320-364-10)
Personnel Required
24 vdc cable connected to truck, (Para 2-9)
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.
TEST OPTIONS
KNOWN INFO
WARNING
Read WARNING
Truck electrical system OK.
Voltage test.
24 vdc cable OK.
REASON FOR QUESTION
POSSIBLE PROBLEMS
If 22 to 28 vdc are not present at
Are 22 to 28 vdc measured
diode assembly connector
Wire 1008C faulty.
on wire 1008C-6 at diode
terminal 10, all marker lights will
Wire 1012B faulty.
assembly connector,
not operate.
Diode assembly faulty.
terminal 10?
Repair wire 1008C-6
(see schematic, Fig
FO-1.1) or replace
NO
trailer main wire
Verify repair,
go to Step 3 of this
Fault.
YES

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