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TM 9-2320-364-20-4
2-3050
1. ARCTIC KIT WATER PUMP DOES NOT OPERATE (CONT).
8.
Are 22 to 28 vdc measured on
wire 1644 at relay R33,
terminal 86?
Repair wire 1644 (see
schematic Fig 2-74)
or notify DS
Maintenance.
Verify repair, go to
Step 11 of this Fault.
YES
NO
Arctic batteries OK.
Balckout stop lights operate
indicating CB20 is OK.
Wire 1435 OK.
Water pump OK.
Wire 1431 from connector
MC119 to CB20 OK.
Wire 1431 between relays R32
and arctic heater switch OK.
Relay R32 OK.
Arctic heater switch OK.
Wire 1644 OK.
Relay R33 not grounded.
Relay R33 faulty.
Wire 1644 to water pump faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Voltage test.
STE/ICE-R #89.
If 22 to 28 vdc are not present,
relay R33 will not operate.
WARNING
9.
Is continuity measured on
relay R33, terminal 85 and a
known good ground?
Repair wire 1435 (see
schematic Fig 2-74)
or notify DS
Maintenance.
Verify repair, go to
Step 11 of this Fault.
YES
NO
Arctic batteries OK.
Blackout stop lights operate
indicating CB20 is OK.
Wire 1435 OK.
Water pump OK.
Wire 1431 from connector
MC119 to CB20 OK.
Wire 1431 between relays R32
and arctic heater switch OK.
Relay R32 OK.
Arctic heater switch OK.
Wire 1644 OK.
Relay R33 grounded.
Relay R33 faulty.
Wire 1644 to water pump faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Continuity test.
STE/ICE-R #91.
If relay R33 is not grounded, it
will not operate.
Read WARNING
on Page 2-3051
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