4-13. 24-VOLT ELECTRICAL SYSTEM TROUBLESHOOTING (CONT).
21. ALL MARKER LIGHTS AND TAILLIGHTS DO NOT OPERATE
(S/N YB6122 075 AND UP).
Tools and Special Tools
Tool Kit, General Mechanic's: Automotive
(Item 50, Appendix J)
Multimeter (Item 28, Appendix J)
Engine OFF, (TM 9-2320-364-10)
24 vdc cable connected to truck, (Para 2-9)
Parking brake applied, (TM 9-2320-364-10)
Wheels chocked, (TM 9-2320-364-10)
All electrical wires and components listed in this troubleshooting procedure are illustrated and located in FO-1.1.
Truck electrical system OK.
REASON FOR QUESTION
If 22 to 28 vdc are not present at
Are 22 to 28 vdc measured
24 vdc cable faulty.
24 vdc cable, between terminals
Wire 1008C-6 faulty.
between terminals E and D
E and D, all marker lights and
Diode assembly faulty.
on trailer end of 24 vdc
taillights will not operate.
Repair 24 vdc cable
(Para 4-31) or replace
24 vdc cable
Verify repair, go to
Step 4 of this Fault.