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LEFT BLACKOUT BRAKE LIGHT WILL NOT LIGHT. cont'd -680640339
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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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WORK LIGHTS 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)
69. WORK LIGHTS WILL NOT LIGHT.
NOTE
Vehicle MASTER disconnect switch must be ON, ignition switch set to ON, and
master light switch set to STOP LIGHT. 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 421 (2)
Step 1.
and ground.
If +24 VDC is not present, reconnect connector A and go to
step 5.
If +24 VDC is present, reconnect connector A and go to step 2.
Step 2. Disconnect connector X (3) and check for +24 VDC between wire 421 (2)
and ground.
If +24 VDC is not present, repair wiring 421 between
connector X and connector A.
If +24 VDC is present, reconnect connector X and go to step 3
Step 3. Loosen nut (4), remove knob (5) and nut (6), and pull work light switch (7)
out of cabinet (8) through opening.
Step 4. Install jumper wire across terminals on work light switch (7) and check if
work lights are lit.
If work lights are not lit, repair wiring 421 between work light
switch and work lights.
If work lights are lit, replace work light switch (page 4-162).
Step 5. Check for +24 VDC between wire 421 (2) and ground at fuse box 1 (9).
If +24 VDC is not present, replace fuse.
If +24 VDC is present, repair wiring 421 between fuse box 1
and connector A.

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