FRONT 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).

11. FRONT 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 front side marker light, but they apply to all front 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

WARNING

Read WARNING

Voltage test.

Truck electrical system OK.

on Page 4-202.3

All other trailer lights operate.

REASON FOR QUESTION

POSSIBLE PROBLEMS

Are 10 to 14 vdc measured on

If voltage is not supplied to

marker light, marker light will

wire 1012B at front side

Wire 1012B faulty.

not operate.

marker light ?

Marker light faulty.

Wire 1435 faulty.

Repair wire 1012B

(see schematic, Fig

FO-3) or replace

trailer main wire

harness.

(Para 4-30.1). Verify

repair, go to Step 3 of

this Fault.

YES

4-202.2