TAILLIGHT(S) DO NOT OPERATE (S/N YB6122 075 AND UP). -725550280

TM 9-2330-385-14

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

15. TAILLIGHT(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

Equipment Condition

(Item 50, Appendix J)

Engine OFF, (TM 9-2320-364-10)

Multimeter (Item 28, Appendix J)

24 vdc cable assembly connected to truck,

Personnel Required

(Para 2-9)

Two

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

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

NOTE

The following troubleshooting procedures cover the left taillight, but they apply to both taillights.

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

Truck electrical system OK.

Continuity test.

on Page 118.21

All other lights on trailer

operate.

REASON FOR QUESTION

If LED composite light ground

Is continuity measured be-

POSSIBLE PROBLEMS

is faulty, LED composite light

tween wire 1435 at LED com-

will not operate.

Wire 1435 faulty.

posite light and a known good

LED composite light faulty.

ground?

Wire 1008B/21 faulty.

Wire 1008B faulty.

Wire 1008C faulty.

Diode assembly faulty.

Repair wire 1435 (see

schematic Fig FO-1.1)

or replace rear side

marker light wire

harness (Para 4-30.1).

Verify repair, go to

Step 6 of this Fault.

YES

4-118.20