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LEFT TAILLIGHT WILL NOT LIGHT. cont'd -680640334
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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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LEFT BLACKOUT TAILLIGHT 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)
67. LEFT BLACKOUT TAILLIGHT 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 (page 3-206) for ail wiring repair steps.
Step 1. Remove two screws (1), two washers (2), and guard (3). Loosen six screws
(4) and remove retainer (5).
Step 2. Remove left blackout tail lamp (6) and check for continuity.
If there is no continuity, replace lamp.
If there is continuity, go to step 3.
Step 3. Disconnect connector B (7) and check for +24 VDC between wire 48 (8)
and ground.
If +24 VDC is not present, repair wiring 48 between
connector B and fuse box 1.
If +24 VDC is present, reconnect connector B and go to step 4.
Step 4. Disconnect connector Y (9) and check for +24 VDC between wire 48 (8)
and ground.
If +24 VDC is not present, repair wiring 48 between
connector Y and connector B.
If +24 VDC is present, reconnect connector Y and go to step 5.
Step 5. Check for +24 VDC between wire 48 (8) and ground at left blackout taillight
connector (10).
If +24 VDC is present, replace rear composite stoplight/taillight
(page 4-190).
If +24 VDC is not present, repair wiring 48 between left
blackout taillight connector and connector Y.

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