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PANEL LIGHTS WILL NOT LIGHT.
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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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PANEL LIGHTS WILL NOT LIGHT. cont'd -680640266
TM 5-2420-224-20-1
Table 3-5. Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
ELECTRICAL SYSTEM (CONT)
NOTE
Vehicle MASTER disconnect switch must be ON and master light switch set to
PANEL BRT. Failure to do so will cause erroneous results.
Refer to wiring diagram (page 3-136) for all wiring repair steps.
Step 1.
Check that all panel lights are lit.
If only speedometer light is not lit, replace speedometer lamp
(page 4-727).
If only tachometer light is not lit, replace tachometer lamp
(page 4-128).
If only indicator (gage) light is not lit, replace indicator (gage)
lamp (page 4-124).
If tachometer light, indicator (gage) light, and voltmeter
gage light are not lit, repair wiring 492 between
speedometer and tachometer.
If indicator (gage) light and voltmeter gage light are not
lit, repair wiring 493 between tachometer and indicator (gage).
If only voltmeter gage light is not lit, go to step 6.
If no lights are lit, go to step 2.
Step 2.
Loosen two captive screws (1) and pull bracket (2) out enough to gain
access to area behind bracket.
Step 3.
Check for +24 VDC between wire 491 (3) and ground at fuse box 1 (4).
If +24 VDC is present, repair wiring 491 between fuse box 1
and speedometer.
If +24 VDC is not present, go to step 4.
Step 4.
Disconnect connector K (5) and check for +24 VDC between wire 49 (6)
and ground.
If +24 VDC is present, repair wiring 49 between connector K
and fuse box 1.
If +24 VDC is not present, reconnect connector K and go to
step 5.
Change 1

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