REAR MARKER LIGHT(S) DO NOT OPERATE (S/N YB6122 075 AND UP). (Cont) -725550443

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 operting, select one to trouble shoot at this time.

VOLTAGE TEST

(1) Disconnect wire 1012B from

nonoperating rear marker light.

(2) Set multimeter select switch to

volts dc.

(3) Connect positive (+) multimeter lead

to center contact of socket.

(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 there are not 10 to 14 vdc

present, perform Steps (6) and (7)

below and repair wire 1012B

(see schematic, Fig FO-1.1) or

replace rear marker light wire

(b) If there are 10 to 14 vdc

present, wire 1012B is OK. Perform

Steps (6) through (8) below 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 continuity measured 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 wire

(b) If there is continuity, replace rear

(4) Install lens cover and two screws.

4-202.17