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BACKUP ALARM WILL NOT SOUND. cont'd
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TM-5-2420-224-20-1 Tractor Wheeled 4x4 DED Small Emplacement Excavator (SEE) and High Mobility Material Handler (HMMH) Manual
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LOW OIL PRESSURE AND HIGH WATER TEMPERATURE ALARM WILL NOT SOUND WITH PRESS-TO-TEST SWITCH DEPRESSED cont'd -680640345
TM 5-2420-224-20-1
Table 3-5. Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
ELECTRICAL SYSTEM (CONT)
71. LOW OIL PRESSURE AND HIGH WATER TEMPERATURE ALARM WILL NOT SOUND WITH
PRESS-TO-TEST SWITCH DEPRESSED.
NOTE
Refer to wiring diagram (page 3-217) for all wiring repair steps.
Depress press-to-test switch (1) and listen for alarm to sound.
Step 1.
If alarm sounds, go to step 12.
If alarm does not sound, go to step 2.
Disconnect wire 306 (2) and wire 07 (3) and remove nut (4) and
Step 2.
press-to-test switch (1).
Step 3.
Check for continuity between terminals of press-to-test switch (1) while
pressing button.
If there is no continuity, replace press-to-test switch.
If there is continuity, install press-to-test switch and go to step 4. _
Disconnect warning delay relay connector (5) and check for continuity
Step 4.
between wire 306 (2) and ground with press-to-test switch (1) depressed.
If there is no continuity, repair wiring 306 between warning
delay relay and press-to-test switch.
If there is continuity, go to step 5.
NOTE
For steps 5 thru 14, engine must be running.
With warning delay relay connector (5) disconnected, check for +24 VDC
Step 5.
between wire 343 (6) and ground at warning delay relay connector.
If +24 VDC is not present, repair wiring 343 between warning
delay relay connector and relay K2.
If +24 VDC is present, go to step 6.
With warning delay relay connector (5) disconnected, check for +24 VDC
Step 6.
between wire 344 (7) and ground at warning delay relay connector.
If +24 VDC is not present, repair wiring 344 at warning delay
relay connector.
If +24 VDC is present, go to step 7.

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