4-13. 24-VOLT ELECTRICAL SYSTEM TROUBLESHOOTING (CONT).
22. AUXILIARY LIGHT BAR 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)
The following troubleshooting procedures need to be performed if extended drawbar/light bar kit has been
All electrical wires and components listed in this troubleshooting procedure are illustrated and located in FO-1.1.
Truck electrical system OK.
on Page 4-69
All other trailer lights operate.
REASON FOR QUESTION
Are 22 to 28 vdc measured
If 22 to 28 vdc are not present at
between terminals E and D
auxiliary light bar 24 vdc cable,
Auxiliary light bar 24 vdc
on rear crossbrace end of
lights will not operate.
auxiliary light bar 24 vdc
Replace auxiliary light
bar 24 vdc cable,
Verify repair, go to
Step 2 of this Fault.