ALL MARKER LIGHTS DO NOT OPERATE.

TM 9-2330-385-14

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

9. ALL MARKER LIGHTS DO NOT OPERATE.

INITIAL SETUP

Tools and Special Tools

References

Tool Kit, General Mechanic's: Automotive

TM 9-3220-364-10

(Item 50, Appendix J)

Multimeter (Item 28, Appendix J)

Equipment Condition

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

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

Personnel Required

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

Two

12 vdc cable assembly connected to truck,

(Para 2-9)

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

Truck electrical system OK.

Voltage test.

on Page 4-193

All other trailer lights operate.

REASON FOR QUESTION

POSSIBLE PROBLEMS

If voltage is not measured on pin

Are 10 to 14 vdc measured

B on 12 vdc cable assembly, rear

12 vdc cable faulty.

on pin B on 12 vdc cable

side marker light and rear marker

Wire 1012-2 faulty.

assembly?

lights will not operate.

Front junction box assembly

faulty.

Repair 12 vdc cable

assembly (Para 4-31)

or replace 12 vdc

cable (Para 2-9).

Verify repair, go to

Step 3 of this

Fault.

YES

4-192