4-14. 12-VOLT ELECTRICAL SYSTEM TROUBLESHOOTING PROCEDURES (CONT).
6. ALL LIGHTS ON REAR OF TRAILER 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)
Wheels chocked, (TM 9-2320-364-10)
Locknut (Item 31, Appendix I)
Parking brake applied, (TM 9-2320-364-10)
12 vdc cable assembly connected to truck,
All electrical wires and components listed in this troubleshooting procedure are illustrated and located in FO-1.
Truck electrical system OK.
on Page 4-179
Front side marker lights operate.
REASON FOR QUESTION
Is continuity measured on wire
If continuity is not measured at
Wire 1435-15 faulty.
1435-15 at rear junction box
rear junction box assembly
assembly terminal 15 and
terminal 15, wire 1435-15 is
faulty and all lights on rear of
trailer will not operate.
Repair wire 1435-15
Fig FO-1) or replace
Verify repair, go to
Step 2 of this Fault.