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Page Title: REAR MARKER LIGHT(S) DO NOT OPERATE (S/N YB6122 075 AND UP). (Cont)
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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
marker light (Para 4-28.1).
(4) Install lens cover and two screws.
4-202.17

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