4-13. 24 VOLT ELECTRICAL SYSTEM TROUBLESHOOTING PROCEDURES (CONT).
1. FRONT SIDE MARKER LIGHT DOES 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 assembly connected to truck,
Parking brake applied, (TM 9-2320-364-10)
Wheels chocked, (TM 9-2320-364-10)
The following troubleshooting procedures cover the left front side marker light, but they apply to both front side
All electrical wires and components listed in this troubleshooting procedure are illustrated and located in FO-1.
Truck electrical system OK.
on Page 4-27
All other trailer lights operate.
REASON FOR QUESTION
If light lamp filament is faulty,
Is continuity measured across
lamp will not operate.
Light lamp faulty.
marker light lamp?
Wire 1435-23 faulty.
Front marker light faulty.
Front junction box faulty.
Wire 1012-24 faulty.
Replace front marker
light lamp (Para 4-27).
Verify repair, go to
Step 6 of this Fault.