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TM 9-2320-364-20-4
2-2997
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) Remove INTERAXLE relay R21.
(2) Turn ON ENGINE switch
(TM 9-2320-364-10).
(3) Is there continuity between
terminals 30 and 87 on HI RANGE
LOCKOUT relay R23?
(a) If there is no continuity,
perform Steps (4) and (5) below
and replace HI RANGE
LOCKOUT relay R23 (Para 7-95).
(b) If there is continuity, HI
RANGE LOCKOUT relay R23 is
OK (Para 7-95).
(4) Turn OFF ENGINE switch.
(5) Install INTERAXLE relay R21.
VOLTAGE TEST
(1) Set multimeter select switch to ohms.
(2) Is there continuity on wire 1885
between HI RANGE LOCKOUT relay
R23, terminal 87, and DIFF LOCK
relay R21, terminal 85?
(a) If there is no continuity,
repair wire 1885 (see schematic
Fig 2-72) or notify
DS Maintenance.
(b) If there is continuity, wire 1885 is
OK.
CONTINUITY TEST
NOTE
Relay test must be performed with relay
partially removed.
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