REAR MARKER LIGHT(S) DO NOT OPERATE. -725550172

TM 9-2330-385-14

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

3. REAR MARKER LIGHT(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)

24 vdc cable assembly connected to truck,

Material/Parts

(Para 2-9)

Locknut (Item 31, Appendix I)

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

Personnel Required

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

Two

NOTE

The following troubleshooting procedures cover one rear marker light, but they apply to all three red rear marker lights.

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

START

TEST OPTIONS

KNOWN INFO

Visual inspection.

Truck electrical system OK.

Does at least two rear marker

All other lights on trailer

lights operate?

operate.

REASON FOR QUESTION

POSSIBLE PROBLEMS

If at least two rear marker lights

do not operate, fault is in ground

Light lamp faulty.

at rear junction box or wire

Rear marker light faulty.

1435-34. If at least two marker

Rear junction box faulty.

lights operate, fault is in rear

Wire 1012-31 faulty.

junction box through rear

Wire 1435-34 faulty.

marker light.

Go to Step 7 of this

Fault.

YES

4-44