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LEFT FRONT BLACKOUT MARKER LIGHT 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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FRONT BLACKOUT LIGHT WILL NOT LIGHT. cont'd
TM
5-2420-224-20-1
Table 3-5. Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
ELECTRICAL SYSTEM (CONT)
32. FRONT BLACKOUT LIGHT WILL NOT LIGHT.
NOTE
Vehicle MASTER disconnect switch must be ON and master light" switch set to BO
DRIVE. Failure to do so will cause erroneous results.
Refer to wiring diagram for all wiring repair steps.
Step 1. Check for +24 VDC between wire 401 (1) and ground at quick disconnect (2).
If +24 VDC is present, replace lamp (3) (page 4-181).
If +24 VDC is not present, go to step 2.
Step 2. Disconnect connector F (4) and check for +24 VDC between wire 401 (1)
and ground.
If +24 VDC is present, repair wiring 401 between connector F
and lamp.
If +24 VDC is not present, reconnect connector F and go to
step 3.
Step 3. Check for +24 VDC between wire 401 (1) and ground at fuse box 2 (5).
If +24 VDC is present, repair wiring 401 between fuse box 2
and connector F.
If +24 VDC is not present, go to step 4.
Step 4. Disconnect connector K (6) and check for +24 VDC between wire 40 (7)
and ground.
If +24 VDC is present, repair wiring 40 between connector K
and fuse box 2.
If +24 VDC is not present, reconnect connector K and go to
step 5.
Step 5. Check for +24 VDC between wire 40 (7) and ground at master light switch
(8).
If +24 VDC is not present, replace master light switch
(page 4-137j.
If +24 VDC is present, repair wiring 40 between master light
switch and connector K.

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