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TM 9-2320-364-20-4
2-2999
(1) Set multimeter select switch to volts
dc.
(2) Connect positive (+) multimeter lead
to DIFF LOCK relay R21, terminal 87.
(3) Connect negative (–) multimeter lead
to a known good ground.
(4) Turn ON ENGINE switch
(TM 9-2320-364-10).
(a) If 10 to 14 vdc are not present,
turn OFF ENGINE switch and
replace DIFF LOCK relay R21
(Para 7-95). Install two ECB
covers and 15 screws.
(b) If 10 to 14 vdc are present,
turn OFF ENGINE switch and
repair wire 1890 (see schematic
Fig 2-72), or notify DS
Maintenance.
(5) Install two ECB covers and 15 screws
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.
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