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Page Title:
BLACKOUT STOPLIGHT(S) DO NOT OPERATE. (Cont) |
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 TM 9-2330-385-14
Remove all jewelry such as rings, dog tags,
S
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.
Resistors mounted on exterior junction box
S
assembly reach very high temperature when power
is applied to circuit. Avoid touching or
contacting resistors when working in or around
junction boxes. Failure to comply could result
in injury to personnel.
VOLTAGE TEST
(1) Remove four locknuts and rear
junction box guard. Discard
locknuts.
(2) Loosen four captive screws and
remove rear junction box cover.
(3) Connect positive (+) multimeter
lead to rear junction box,
terminal 18.
(4) Connect negative (--) multimeter
lead to a known good ground.
(5) Turn on BLACKOUT LIGHTS
selector switch (TM 9-2320-364-10).
(6) While assistant fully applies brake
pedal, observe multimeter.
(a) If 22 to 28 vdc are not present,
perform Steps (7) and (8) below
and repair wire 1678C-18 (see
schematic, Fig FO-1) or replace
wire harness (Para 4-30).
(b) If 22 to 28 vdc are present,
perform Steps (7) and (8) below
and replace rear junction box
(7) Release brake pedal.
(8) Turn off BLACKOUT LIGHTS
selector switch.
(9) Install rear junction box cover and
tighten four captive screws.
(10) Install rear junction box guard and
four locknuts.
VERIFY REPAIR
(1) Turn on BLACKOUT LIGHTS selector
switch (TM 9-2320-364-10).
(2) While assistant fully applies brake
pedal, observe blackout stoplights.
(a) If blackout stoplights do not
operate, fault not corrected.
Perform Steps (3) and (4) below
and notify supervisor.
(b) If blackout stoplights operate,
fault has been corrected.
(3) Release brake pedal.
(4) Turn off BLACKOUT LIGHTS selector
switch.
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