REAR SIDE MARKER LIGHT(S) DO NOT OPERATE (S/N YB6122 075 AND UP).

TM 9-2330-385-14

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

12. REAR SIDE MARKER LIGHT(S) 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)

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

Personnel Required

12 vdc cable assembly connected to

Two

truck, (Para 2-9)

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

NOTE

The following troubleshooting procedures cover the left rear side marker light, but they apply to all rear side marker

lights.

All electrical wires and components listed in this troubleshooting procedure are illustrated and located in FO-1.1.

START

KNOWN INFO

TEST OPTIONS

Visual inspection.

Truck electrical system OK.

All other trailer lights operate.

REASON FOR QUESTION

POSSIBLE PROBLEMS

Does at least one rear side or

If no rear side or rear marker

Wire 1012B faulty.

lights operate, fault is trailer

rear marker light operate?

Wire 1435 faulty.

main wire harness wire 1012B.

Rear side marker light faulty.

If at least one rear side or rear

marker light operates, fault is

from rear junction box through

rear side marker light.

Repair wire 1012B

(see schematic, Fig

FO-1.1) or replace

trailer main wire

harness.

(Para 4-30.1). Verify

repair, go to Step 4 of

this Fault.

YES

4-202.8