ALL MARKER LIGHTS DO NOT OPERATE (S/N YB6122 075 AND UP). (Cont) -725550486

TM 9-2330-385-14

19. ALL MARKER LIGHTS DO NOT OPERATE (S/N YB6122 075 AND UP) (CONT).

KNOWN INFO

TEST OPTIONS

WARNING

Read WARNING

Truck electrical system OK.

Continuity test

on Page 4-202.61

All other trailer lights operate.

12 vdc cable OK.

REASON FOR QUESTION

Wire 1012-2 OK.

Is continuity measured

If continuity is measured

across wire 1012B between

across wire 1012B, diode

diode assembly connector,

assembly is faulty. If not, wire

1012B is faulty. If wire 1012B,

terminal 5 and the rear

POSSIBLE PROBLEMS

or diode assembly is faulty,

junction box.

voltage is not supplied to

Wire 1012B faulty.

marker lights.

Diode assembly faulty.

Repair wire 1012B

(see schematic, Fig

FO-1.1) or replace

trailer main wire

Verify repair, go to

Step 4 of this Fault.

YES

Replace diode

assembly (Para

4-30.1). Verify repair,

go to Step 4 of this

Fault.

4-202.60