TAILLIGHT(S) DO NOT OPERATE (S/N YB6122 075 AND UP). (Cont) -725550288

TM 9-2330-385-14

15. TAILLIGHT DOES NOT OPERATE (S/N YB6122 075 AND UP) (CONT).

KNOWN INFO

WARNING

TEST OPTIONS

Read WARNING

Truck electrical system OK.

on Page 4-118.29

Voltage test.

All other lights on trailer

operate.

REASON FOR QUESTION

Wire 1435 OK.

Are 22 to 28 vdc measured

LED composite light OK.

on wire 1008C at diode

If 22 to 28 vdc is not supplied to

Wire 1008B/21 OK.

diode assembly connector, ter-

Wire 1008B OK.

assembly connector terminal

minal 12, wire 1008C is faulty.

12?

If 22 to 28 vdc is supplied to

diode assembly connector,

POSSIBLE PROBLEMS

diode assembly is faulty.

Wire 1008C faulty.

Repair wire 1008C

Diode assembly faulty.

(see schematic Fig

FO-1.1) or replace

trailer main wire

harness (Para

4-30.1). Verifty repair,

go to Step 6 of this

fault.

YES

Replace diode

assembly. Verify

repair, Go to Step 6 of

this fault.

4-118.28