STOPLIGHT(S) DO NOT OPERATE (S/N YB6122 075 AND UP). -725550292

TM 9-2330-385-14

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

16. STOPLIGHT(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)

Truck air pressure charged, (TM 9-2320-364-10)

Personnel Required

24 vdc cable assembly connected to truck,

Two

(Para 2-9)

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

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

NOTE

The following troubleshooting procedures cover the left stoplight, but they apply to both stoplights.

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.

Voltage test.

on Page 4-118.33

All other lights on trailer

operate.

REASON FOR QUESTION

Tailight's operate indicating

Are 22 to 28 vdc measured on

LED composite light ground

If 22 to 28 vdc are present on

(wire 1435) OK.

wire 1003C/22 at LED

wire 1003C/22 LED composite

composite light?

light is faulty.

POSSIBLE PROBLEMS

LED composite light faulty.

24 vdc cable faulty.

Wire 1003C faulty.

Wire 1003C/22 faulty.

Go to Step 2 of this

Fault.

YES

Replace LED com-

posite light (Para

4-29). Verify repair,

go to Step 4 of this

Fault.

4-118.32