ALL MARKER LIGHTS AND TAILLIGHTS DO NOT OPERATE (S/N YB6122 075 AND UP).

TM 9-2330-385-14

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

21. ALL MARKER LIGHTS AND TAILLIGHTS 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)

Multimeter (Item 28, Appendix J)

Equipment Condition

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

Personnel Required

24 vdc cable connected to truck, (Para 2-9)

Two

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

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

NOTE

All electrical wires and components listed in this troubleshooting procedure are illustrated and located in FO-1.1.

START

TEST OPTIONS

KNOWN INFO

WARNING

Read WARNING

Voltage test.

Truck electrical system OK.

on Page 4-118.63

REASON FOR QUESTION

POSSIBLE PROBLEMS

If 22 to 28 vdc are not present at

Are 22 to 28 vdc measured

24 vdc cable faulty.

24 vdc cable, between terminals

Wire 1008C-6 faulty.

between terminals E and D

E and D, all marker lights and

Diode assembly faulty.

on trailer end of 24 vdc

taillights will not operate.

cable?

Repair 24 vdc cable

(Para 4-31) or replace

24 vdc cable

(Para 2-9).

Verify repair, go to

Step 4 of this Fault.

YES

4-118.62