ALL LIGHTS ON REAR OF TRAILER DO NOT OPERATE (S/N YB6122 075 AND UP). -725550312

TM 9-2330-385-14

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

19. ALL LIGHTS ON REAR OF TRAILER DO NOT OPERATE

(S/N YB6122 075 AND UP).

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,

Personnel Required

(Para 2-9)

Two

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

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

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 4-118.53

Front side marker lights operate.

REASON FOR QUESTION

POSSIBLE PROBLEMS

Is continuity measured on

If continuity is not measured

wire 1435 between rear

Wire 1435 faulty.

between rear junction box

junction box and a known

terminal, wire 1435 and a

good ground?

known good ground, wire 1435

is faulty and all lights on rear

of trailer will not operate.

Repair wire 1435

(see schematic, Fig

FO-1.1) or replace

trailer main wire

harness (Para

4-30.1).

Verify repair, go to

Step 2 of this Fault.

YES

4-118.52