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TM 9-2320-364-20-3
2-2919
(1) Disconnect connector MC73 from fan
controller.
(2) Set multimeter select switch to
volts dc.
(3) Turn ON ENGINE switch
(TM 9-2320-364-10).
(4) Connect positive multimeter lead to
connector MC73, terminal A.
(5) Connect negative () multimeter lead
to a known good ground.
(a) If 22 to 28 vdc are not present,
perform Step (6) below
and repair wire 1538 (see
schematic Fig 2-67), or notify DS
Maintenance.
(b) If 22 to 28 vdc are present,
wire 1538 is OK.
(6) 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.
(1) Set multimeter select switch to ohms.
(2) Is there continuity between connector
MC73, terminal B and a known
good ground?
(a) If there is no continuity, repair wire
1435 (see schematic Fig 2-67) or
notify DS Maintenance. Perform
Step (3) below.
(b) If there is continuity, wire 1435 is
OK.
(3) Connect connector MC73 to fan
controller.
CONTINUITY TEST
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