ALL MARKER LIGHTS DO NOT OPERATE (S/N YB6122 075 AND UP). (Cont) -725550318

TM 9-2330-385-14

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

TEST OPTIONS

KNOWN INFO

WARNING

Read WARNING

Truck electrical system OK.

Continuity test.

on Page 4-118.59

24 vdc cable OK.

Wire 1008C OK.

REASON FOR QUESTION

If continuity is measured across

POSSIBLE PROBLEMS

Is continuity measured

wire 1012B, diode assembly is

across wire 1012B between

faulty. If continuity is not

Wire 1012B faulty.

diode assembly connector,

measured, wire 1012B is faulty.

Diode assembly faulty.

terminal 9 and the rear

If wire 1012B or diode assembly

junction box.?

is faulty, marker lights will not

operate.

Repair wire 1012B

(see schematic, Fig

FO-1.1) or replace

trailer main wire

Verify repair, go to

Step 3 of this Fault.

YES

Replace diode

assembly (Para

4-30.1). Verifty repair,

go to Step 3 of this

Fault.

4-118.58