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TM 9-2320-364-20-4
2-2989
(1) Remove 15 screws and ECB covers.
(2) Connect positive (+) multimeter lead
to DIFF LOCK relay R21, terminal 30.
(3) Connect negative (–) multimeter lead
to a known good ground.
(4) Turn ON ENGINE switch.
(a) If 10 to 14 vdc are not
present, turn OFF ENGINE switch
and repair wire 1882
(see schematic Fig 2-72), or notify
DS Maintenance.
(b) If 10 to 14 vdc are present,
wire 1882 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 and 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) Connect positive (+) multimeter lead
to DIFF LOCK relay R21, terminal 86.
(2) Connect negative (–) multimeter lead
to a known good ground.
(3) Turn ON ENGINE switch
(TM 9-2320-364-10).
(a) If 22 to 28 vdc are not present,
turn OFF ENGINE switch and
repair wire 1888 (see schematic
Fig 2-72), or notify DS
Maintenance.
(b) If 22 to 28 vdc are present,
wire 1888 is OK.
(4) Turn OFF ENGINE switch.
VOLTAGE TEST
Relay test must be performed with relay
partially removed.
NOTE
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