TAILLIGHT AND STOPLIGHT DO NOT OPERATE.

TM 9-2330-385-14

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

7. TAILLIGHT AND STOPLIGHT 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)

12 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 and stoplight.

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

START

KNOWN INFO

TEST OPTIONS

WARNING

Read WARNING

Truck electrical system OK.

Continuity test.

on Page 4-183

All other trailer lights operate.

REASON FOR QUESTION

POSSIBLE PROBLEMS

Is continuity measured on

If continuity is not measured at

wire 1435-25 and a known

Wire 1435-25 faulty.

wire 1435-25 connector,

good ground?

Composite light faulty.

composite light ground is faulty

or if there is continuity on wire

1435-25, composite light is faulty

and lights will not operate.

Repair wire 1435-25

(see schematic, Fig

FO-1) or replace side

composite light

harness (Para 4-30).

Verify repair, go to

Step 2 of this Fault.

YES

Replace rear

composite light

(Para 4-29).

Verify repair, go to

Step 2 of this

Fault.

4-182