4-13. 24 VOLT ELECTRICAL SYSTEM TROUBLESHOOTING PROCEDURES (CONT).
3. REAR 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,
Locknut (Item 31, Appendix I)
Parking brake applied, (TM 9-2320-364-10)
Wheels chocked, (TM 9-2320-364-10)
The following troubleshooting procedures cover one rear marker light, but they apply to all three red rear marker lights.
All electrical wires and components listed in this troubleshooting procedure are illustrated and located in FO-1.
Truck electrical system OK.
Does at least two rear marker
All other lights on trailer
REASON FOR QUESTION
If at least two rear marker lights
do not operate, fault is in ground
Light lamp faulty.
at rear junction box or wire
Rear marker light faulty.
1435-34. If at least two marker
Rear junction box faulty.
lights operate, fault is in rear
Wire 1012-31 faulty.
junction box through rear
Wire 1435-34 faulty.
Go to Step 7 of this