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TM 9-2320-364-20-2
2-1563
(1) Remove 15 screws and two
ECB covers.
(2) Connect positive (+) multimeter lead
to wire 1676 at trailer blackout
stoplight relay R13, terminal 30.
(3) Connect negative (–) multimeter lead
to known good ground.
(4) Turn ON ENGINE switch
and observe multimeter
(TM 9-2320-364-10).
(a) If 22 to 28 vdc are not present,
turn OFF ENGINE switch and
repair wire 1676 (see schematic
Fig 2-35) or notify DS
Maintenance.
(b) If 22 to 28 vdc are present, wire
1676 is OK.
(5) Turn OFF ENGINE switch.
VOLTAGE TEST
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.
Circuit breakers CB5, CB6, CB12, CB20, CB22, CB23 and relays R3, R13 - R19, R26, R28, R32, R33
are always electrically hot and can cause severe injury to personnel. Care must be exercised when
working under the electrical circuit board cover.
(1) Set multimeter select switch to
volts dc.
(2) Connect positive (+) multimeter
lead to wire 1678 at relay R13,
terminal 86.
(3) Connect negative (–) multimeter
lead to known good ground.
(4) Turn on BLACKOUT MARKER
lights switch (TM 9-2320-364-10).
(5) Turn on BLACKOUT LIGHTS
selector switch.
(6) Turn ON ENGINE switch
(7) While assistant applies brake pedal,
observe multimeter.
(a)
If 22 to 28 vdc are not present,
perform Steps (8) through (11)
below and repair wire 1678 (see
schematic Fig 2-35) or notify DS
Maintenance.
(b)
If 22 to 28 vdc are present, wire
1678 is OK.
(8) Release brake pedal.
(9) Turn OFF ENGINE switch.
(10) Turn off BLACKOUT LIGHTS
selector switch.
(11) Turn off BLACKOUT MARKER
lights switch.
VOLTAGE TEST
Relay test must be performed with relay
partially removed.
Relay test must be performed with relay
partially removed.
NOTE
NOTE
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