4-13. 24 VOLT ELECTRICAL SYSTEM TROUBLESHOOTING PROCEDURES (CONT).
2. REAR SIDE MARKER LIGHT(S) 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 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.
Does at least one rear side
All other trailer lights operate.
marker light operate?
REASON FOR QUESTION
If no rear side marker lights
Rear junction box faulty.
operate when power is applied,
Light lamp faulty.
fault is rear junction box. If only
Rear side marker light faulty.
one rear side marker light
Wire 1012-26 faulty.
operates, fault is wire 1012-26
through rear side marker light.
Replace rear junction
Verify repair, go to
Step 7 of this Fault.