TAILLIGHT(S) DO NOT OPERATE (S/N YB6122 075 AND UP). (Cont) -725550284

TM 9-2330-385-14

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

KNOWN INFO

WARNING

TEST OPTIONS

Read WARNING

on Page 118.25

Voltage test.

Truck electrical system OK.

All other lights on trailer

REASON FOR QUESTION

operate.

Are 22 to 28 vdc measured on

Wire 1435 OK.

If voltage is not supplied to

wire 1008B at rear junction

LED composite light OK.

rear junction box termina,l wire

box?

1008B, fault is between trailer

connector and rear junction

box. If voltage is supplied to

POSSIBLE PROBLEMS

rear junction box, composite

light wire harness wire

Wire 1008B/21 faulty.

1008B/21 is faulty.

Wire 1008B faulty.

Wire 1008C faulty.

Diode assembly faulty.

Go to Step 4 of this

Fault.

YES

Repair wire

1008B/21

(see schematic,

composite light wire

harness (Para

4-30.1). Verify repair,

go to Step 6 of this

Fault.

4-118.24