TAILLIGHT DOES NOT OPERATE.

TM 9-2330-385-14

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

4. TAILLIGHT DOES 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

24 vdc cable assembly connected to truck,

Locknut (Item 31, Appendix I)

(Para 2-9)

Packing, Preformed (Item 59, Appendix I)

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

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

Personnel Required

Two

NOTE

The following troubleshooting procedures cover the left taillight, but they apply to both taillights.

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

Trailer may be equipped with composite lights or LED composite lights.

If LED composite light is installed, go to Step 2.1 of this Fault.

START

KNOWN INFO

TEST OPTIONS

WARNING

Read WARNING

Truck electrical system OK.

Continuity test.

on Page 4-55

All other lights on trailer

operate.

REASON FOR QUESTION

Is continuity measured across

POSSIBLE PROBLEMS

If light lamp filament is faulty,

light lamp?

lamp will not operate.

Taillight lamp faulty.

Taillight faulty.

Rear junction box faulty.

Wire 1008/21-29 faulty.

Replace taillight lamp

(Para 4-29).

Verify repair, go to

Step 6 of this Fault.

YES

4-54