4-13. 24-VOLT ELECTRICAL SYSTEM TROUBLESHOOTING (CONT).
10. ALL MARKER LIGHTS AND TAILLIGHTS DO NOT OPERATE.
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.
Truck electrical system OK.
on Page 4-109
REASON FOR QUESTION
If 22 to 28 vdc are not present at
24 vdc cable faulty.
Are 22 to 28 vdc measured at
24 vdc cable terminal E, lights
Auxiliary light bar 24 vdc cable
terminal E and D on trailer
will not operate.
faulty (if equipped).
end of 24 vdc cable?
Wire 1008C-6 faulty.
Front junction box faulty.
Repair 24 vdc cable
(Para 4-31) or replace
24 vdc cable
Verify repair, go to
Step 4 of this Fault.