REAR SIDE MARKER LIGHTS AND REAR MARKER LIGHTS DO NOT OPERATE.

TM 9-2330-385-14

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

8. REAR SIDE MARKER LIGHTS AND REAR MARKER LIGHTS 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)

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

Materials/Parts

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

Locknut (Item 31, Appendix I)

12 vdc cable assembly connected to truck,

(Para 2-9)

Personnel Required

Two

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 4-187

All other trailer lights operate.

REASON FOR QUESTION

POSSIBLE PROBLEMS

Are 10 to 14 vdc measured on

If voltage is not measured on

front junction box assembly

Front junction box assembly

front junction box assembly,

faulty.

at terminal 22?

rear side marker light and rear

Wire 1012B-22 faulty.

marker lights will not operate.

Rear junction box assembly

faulty.

Replace front junction

box assembly

(Para 4-25).

Verify repair, go to

Step 3 of this Fault.

YES

4-186