REAR SIDE MARKER LIGHTS AND REAR MARKER LIGHTS DO NOT OPERATE (S/N YB6122 075 AND UP).

TM 9-2330-385-14

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

18. REAR SIDE MARKER LIGHTS AND REAR MARKER LIGHTS 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

Equipment Condition

Multimeter (Item 28, Appendix J)

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,

NOTE

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

START

KNOWN INFO

TEST OPTIONS

WARNING

Read WARNING

Truck electrical system OK.

Voltage test.

on Page 4-202.53

All other trailer lights operate.

REASON FOR QUESTION

POSSIBLE PROBLEMS

Are 10 to 14 vdc measured on

If voltage is not supplied to rear

wire 1012B at rear junction

Wire 1012B faulty.

junction box on wire 1012B,

box?

lights will not operate.

Repair Wire 1012B

(see schematic, Fig

FO-1.1) or replace

trailer main wire

Verify repair, go to

Step 2 of this Fault.

YES

4-202.52