ALL LIGHTS ON REAR OF TRAILER DO NOT OPERATE. -725550402

TM 9-2330-385-14

4-14. 12-VOLT ELECTRICAL SYSTEM TROUBLESHOOTING PROCEDURES (CONT).

6. ALL LIGHTS ON REAR OF TRAILER DO NOT OPERATE.

INITIAL SETUP

Tools and Special Tools

References

Tool Kit, General Mechanic's: Automotive

TM 9-2320-364-10

(Item 50, Appendix J)

Equipment Condition

Multimeter (Item 28, Appendix J)

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

Materials/Parts

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,

Personnel Required

(Para 2-9)

Two

NOTE

All electrical wires and components listed in this troubleshooting procedure are illustrated and located in FO-1.

START

KNOWN INFO

TEST OPTIONS

WARNING

Read WARNING

Truck electrical system OK.

Continuity test.

on Page 4-179

Front side marker lights operate.

REASON FOR QUESTION

POSSIBLE PROBLEMS

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

ground?

trailer will not operate.

Repair wire 1435-15

(see schematic,

Fig FO-1) or replace

wire harness

(Para 4-30).

Verify repair, go to

Step 2 of this Fault.

YES

4-178