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.
If more than one rear marker light is not operating,
select one to troubleshoot at this time.
(1) Disconnect wire 1012B at nonoperating
rear marker light.
(2) Set multimeter select switch to
(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
(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
(a) If there is no continuity, repair
wire 1435 (see schematic, Fig
FO-1.1) or replace rear marker light
wire harness (Para 4-30.1).
(b) If there is continuity, replace rear
marker light assembly (Para
(4) Install lens cover and two screws.