REAR MARKER LIGHT(S) DO NOT OPERATE. -725550356

TM 9-2330-385-14

4-14. 12-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)

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

Personnel Required

12 vdc cable assembly connected to truck,

Two

(Para 2-9)

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

NOTE

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

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

START

KNOWN INFO

TEST OPTIONS

Truck electrical system OK.

Does at least two rear marker

Visual inspection.

All other trailer lights operate.

lights operate when power is

applied?

REASON FOR QUESTION

POSSIBLE PROBLEMS

If no rear marker lights operate,

Wire 1435-34 faulty.

fault is in wire 1435-34. If at

Light lamp faulty.

least two rear marker lights

Marker light faulty.

operate, fault is between wire

Wire 1012-31 faulty.

1012-31 and faulty light lamp.

Repair wire 1435-34

(see schematic, Fig

FO-1) or replace rear

center marker

harness (Para 4-30).

Verify repair, go to

Step 7 of this Fault.

YES

4-140