TAILLIGHT(S) DO NOT OPERATE (S/N YB6122 075 AND UP). -725550446

TM 9-2330-385-14

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

14. 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

(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, (Para 2-9)

Personnel Required

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

Two

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

Truck electrical system OK.

Visual inspection.

Does at least one taillight

operate when power is

REASON FOR QUESTION

applied?

POSSIBLE PROBLEMS

If no taillights operate when pow-

er is applied, fault is in the 12

Wire 1435 faulty.

vdc cable assembly through rear

Wire 1008B/21 faulty.

junction box assembly. If at

12 vdc cable assembly faulty.

least one taillight operates, fault

Wire 1008B faulty.

is between rear junction box and

Wire 1008-1 faulty.

LED composite light.

Diode assembly faulty.

LED composite light faulty.

Go to Step 4 of this

Fault.

YES

4-202.20