ALL LIGHTS ON REAR OF TRAILER DO NOT OPERATE (S/N YB6122 075 AND UP). -725550470

TM 9-2330-385-14

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).

INITIAL SETUP

References

Tools and Special Tools

TM 9-2320-364-10

Tool Kit, General Mechanic's: Automotive

(Item 50, Appendix J)

Equipment Condition

Multimeter (Item 28, Appendix J)

Engine OFF, (TM 9-2320-364-10)

Wheels chocked, (TM 9-2320-364-10)

Personnel Required

Parking brake applied, (TM 9-2320-364-10)

Two

12 vdc cable assembly connected to truck,

(Para 2-9)

NOTE

All electrical wires and components listed in this troubleshooting procedure are illustrated and located in FO-1.1.

START

KNOWN INFO

TEST OPTIONS

WARNING

Read WARNING

Truck electrical system OK.

Continuity test.

on Page 4-202.45

Front side marker lights operate.

REASON FOR QUESTION

POSSIBLE PROBLEMS

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

ground?

all lights on rear of trailer will

not operate.

Repair wire 1435

(see schematic,

Fig FO-3) or replace

trailer main wire

harness (Para 4-30).

Verify repair, go to

Step 2 of this Fault.

YES

4-202.44