ALL LIGHTS ON REAR OF TRAILER DO NOT OPERATE. -725550240

TM 9-2330-385-14

4-13. 24 VOLT ELECTRICAL SYSTEM TROUBLESHOOTING PROCEDURES (CONT).

8. 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)

24 vdc cable assembly connected to truck,

Materials/Parts

Locknut (Item 31, Appendix I)

(Para 2-9)

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

Personnel Required

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

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 4-99

Front side marker lights operate.

REASON FOR QUESTION

POSSIBLE PROBLEMS

Is continuity measured on

If continuity is not measured

wire 1435-15 at rear junction

Wire 1435-15 faulty.

between rear junction box

box assembly, terminal 15

assembly terminal 15 and a

and a known good ground?

known good ground, wire 1435-

15 is faulty and all lights on rear

of 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

4-98