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TM
5-2420-224-20-1
Table 3-5. Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
ELECTRICAL SYSTEM (CONT)
44. WATER TEMPERATURE GAGE SHOWS NO INDICATION.
NOTE
Resistance will vary depending on water temperature.
Refer to wiring diagram for all wiring repair steps.
Disconnect wire 31T (1) from water temperature sending unit (2) and check
Step 1.
for resistance between terminal (3) and shell of water temperature sending
unit (2).
If there is no resistance, replace water temperature sending
unit (page 4-203).
If there is resistance, go to step 2.
Step 2. With wire 31T (1) disconnected from water temperature sending unit (2),
check for +24 VDC between wire 31T and ground at water temperature
sending unit.
If +24 VDC is present, replace water temperature sending unit
(page 4-203).
If +24 VDC is not present, go to step 3.
Step 3. With wire 31T (1) disconnected from water temperature sending unit, check
for +24 VDC between wire 31T and ground at connector D (4).
If +24 VDC is present, repair wiring 31T between connector D
and water temperature sending unit.
If +24 VDC is not present, go to step 4.
Step 4. Loosen two captive screws (5) and pull bracket (6) out enough to gain
access to area behind bracket.
Step 5. Remove two clamps (7) and pipe assembly (8).
Step 6. With wire 31T (1) disconnected from water temperature sending unit, check
for +24 VDC between wire 31T and ground at indicator (gage) (9).
If +24 VDC is not present, reconnect wire 31T at water
temperature sending unit and replace indicator (gage)
(page 4-124).
I f +24 VDC is present, reconnect wire 31T at water
temperature sending unit and repair wiring 31T between
indicator (gage) and connector D.

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