4-14. 12-VOLT ELECTRICAL SYSTEM TROUBLESHOOTING PROCEDURES (CONT).
16. ALL LIGHTS ON REAR OF TRAILER 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)
Wheels chocked, (TM 9-2320-364-10)
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-1.1.
Truck electrical system OK.
Front side marker lights operate.
REASON FOR QUESTION
Is continuity measured on wire
If continuity is not measured
Wire 1435 faulty.
1435 between rear junction
rear junction box terminal wire
box and a known good
1435 and a known good
ground, wire 1435 is faulty and
all lights on rear of trailer will
Repair wire 1435
Fig FO-3) or replace
trailer main wire
harness (Para 4-30).
Verify repair, go to
Step 2 of this Fault.