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Page Title:
BLACKOUT STOPLIGHT(S) DO NOT OPERATE. (Cont) |
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 TM 9-2330-385-14
CONNECTOR
MC 15
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 of junction box
S
assembly reach very high temperatures 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) Disconnect 24 vdc (12 pin) cable from
24 VDC
front junction box connector MC15.
CABLE
J
A
(2) Set multimeter select switch to volts DC.
K
B
H
(3) Connect positive (+) multimeter lead
L
N
C
M
F
to pin F on trailer end connector.
E
D
(4) Connect negative (--) multimeter lead
to pin D on trailer end connector.
(5) Turn on BLACKOUT LIGHTS selector
switch (TM 9-2320-364-10).
PIN F
PIN D
(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 replace 24 vdc cable.
(b) If 22 to 28 vdc are present, 24 vdc
cable is OK.
(7) Release brake pedal.
(8) Turn off BLACKOUT LIGHTS selector
switch.
(9) Connect 24 vdc cable to front junction
box connector MC15.
VOLTAGE TEST
(1) Loosen four captive screws and
remove front junction box cover.
(2) Connect positive (+) multimeter lead
to front junction box, terminal 7.
(3) Connect negative (--) multimeter lead
to a known good ground.
(4) Turn on BLACKOUT LIGHTS selector
switch (TM 9-2320-364-10).
(5) While assistant fully applies brake
pedal, observe multimeter.
(a) If 22 to 28 vdc are not present,
perform Steps (6) and (7) below
and replace connector MC15
(b) If 22 to 28 vdc are present,
connector MC15 is OK.
(6) Release brake pedal.
(7) Turn off BLACKOUT LIGHTS selector
switch.
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