ALL TRAILER LIGHTS DO NOT OPERATE.

TM 9-2330-385-14

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

10. ALL TRAILER LIGHTS DO NOT OPERATE.

INITIAL SETUP

Tools and Special Tools

References

Tool Kit, General Mechanic's: Automotive

TM 9-2320-364-10

Equipment Condition

Multimeter (Item 28, Appendix J)

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

12 vdc cable assembly connected to truck,

Personnel Required

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.

START

KNOWN INFO

TEST OPTIONS

WARNING

Read WARNING

Continuity test.

Truck electrical system OK.

on Page 4-199

REASON FOR QUESTION

POSSIBLE PROBLEMS

Is continuity measured

If continuity is not measured

12 vdc cable faulty.

between 12 vdc cable, pin A

between 12 vdc cable, pin A

Wire 1435-3 faulty.

and a known good ground, 12

and a known good ground?

Front junction box faulty.

vdc cable is faulty.

Repair 12 vdc cable

12 vdc cable

Verify repair, go to

Step 3 of this Fault.

YES

4-198