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WORK LIGHTS WILL NOT LIGHT. 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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BACKUP ALARM WILL NOT SOUND. cont'd
TM 5-2420-224-20-1
Table 3-5. Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
ELECTRICAL SYSTEM (CONT)
70. BACKUP ALARM WILL NOT SOUND.
NOTE
Vehicle MASTER disconnect switch must be ON, ignition switch set to ON, and
group shift lever shifted to R position. Failure to do so will cause erroneous results.
Refer to wiring diagram for all wiring repair steps.
Disconnect connector A (1) and check for +24 VDC between wire 35R (2)
Step 1.
and ground.
If +24 VDC is present, reconnect connect A and go to
If +24 VDC is not present, reconnect connector A and go to
step 2.
Step 2. Check for +24 VDC between wire 35R (2) and ground at fuse box 1 (3).
If +24 VDC is not present, replace fuse.
If +24 VDC is present, repair wiring 35R between fuse box 1
and connector A.
Step 3. Check for +24 VDC between wire 35R (2) and ground at backup alarm
switch (4).
If +24 VDC is not present, repair wiring 35R between
connector A and backup alarm switch.
If +24 VDC is present, go to step 4.
Step 4. Check for +24 VDC between wire 35R1 (5) and ground at backup alarm
switch (4).
If +24 VDC is not present, replace backup alarm switch
(page 4-208).
If +24 VDC is present, go to step 5.
Step 5. Disconnect connector Z (6) and check for +24 VDC between wire 35R1 (5)
and ground.
If +24 VDC is not present, repair wiring 35R1 between
connector Z and backup alarm switch.
If +24 VDC is present, reconnect connector Z and go to step 6.
Step 6. Check for +24 VDC between wire 35R1 (5) and ground at backup alarm (7).
If +24 VDC is present, replace backup alarm (page 4-214).
If +24 VDC is not present, repair wiring 35R1 between
connector Z and backup alarm.

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