REAR MARKER LIGHT(S) DO NOT OPERATE (S/N YB6122 075 AND UP). (Cont) -725550277

TM 9-2330-385-14

Remove all jewelry such as rings, dog tags, bracelets, etc. If jewelry or tools contact positive electrical

circuits, a direct short may result. Damage to equipment, injury, or death to personnel may occur.

NOTE

If more than one rear marker light is not operating,

select one to troubleshoot at this time.

VOLTAGE TEST

(1) Disconnect wire 1012B at nonoperating

rear marker light.

(2) Set multimeter select switch to

volts dc.

(3) Connect positive (+) multimeter lead

to wire 1012B.

(4) Connect negative (--) multimeter lead

to a known good ground.

(5) While assistant turns ON ENGINE

switch and turns on lights, observe

multimeter (TM 9-2320-364-10).

(a) If 22 to 28 vdc are not present,

perform Steps (6) and (7) below

and repair wire 1012B (see

schematic Fig FO-1.1) or replace

rear marker light wire harness

(b) If 22 to 28 vdc are present, wire

1012B is OK. Perform Steps(6)

through (8) and go to Step 3

of this Fault.

(6) Turn off lights.

(7) Turn OFF ENGINE switch.

(8) Connect wire 1012B to rear marker

light connector.

CONTINUITY TEST

(1) Remove two screws and lens cover.

(2) Set multimeter select switch to ohms.

(3) Is there continuity between rear marker

light, ground contact and a known

good ground.

(a) If there is no continuity, repair

wire 1435 (see schematic, Fig

FO-1.1) or replace rear marker light

(b) If there is continuity, replace rear

marker light assembly (Para

4-28.1)

(4) Install lens cover and two screws.

4-118.17