STOPLIGHT(S) DO NOT OPERATE.

TM 9-2330-385-14

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

5. STOPLIGHT(S) 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)

12 vdc cable assembly connected to

Packing, Preformed (Item 59, Appendix I)

truck, (TM 9-2320-364-10)

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

Personnel Required

Two

NOTE

The following troubleshooting procedures cover the left stoplight, but they apply to both stoplights.

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 4.1 of this Fault.

START

KNOWN INFO

TEST OPTIONS

WARNING

Read WARNING

Continuity test.

Truck electrical system OK.

on Page 4-167

All other lights on trailer

operate.

REASON FOR QUESTION

Is continuity measured across

POSSIBLE PROBLEMS

If light lamp filament is faulty,

stoplight lamp?

lamp will not operate.

Stoplight lamp faulty.

Composite light faulty.

12 vdc cable faulty.

Connector MC16 faulty.

Front junction box faulty.

Wire 1003-17 faulty.

Rear junction box faulty.

Wire 1003/22-30 faulty.

Replace stoplight

lamp (Para 4-29).

Verify repair, go to

Step 10 of this Fault.

YES

4-166