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ELECTRICAL SYSTEM (CONT) -680640223
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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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ELECTRICAL SYSTEM (CONT) -680640225
TM 5-2420-224-20-1
Table 3-5. Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
ELECTRICAL SYSTEM (CONT)
19. RIGHT FRONT AUXILIARY HEADLIGHT HIGH BEAM WILL NOT LIGHT.
NOTE
Vehicle MASTER disconnect switch must be ON, master light switch set to SER
DRIVE, horn, low beam/high beam switch set to Hl, and auxiliary light control
switch in up position. 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 42HR (1) and ground at auxiliary headlight
connector (2).
If +24 VDC is not present, go to step 4.
If +24 VDC is present, go to step 2.
Step 2. Remove two bolts (3), lamp guard (4), mount (5), and lamp (6).
Step 3. Check for +24 VDC between wire 42HR (1) and ground at socket (7).
If +24 VDC is present, replace lamp.
If +24 VDC is not present, repair wiring 42HR between socket
and auxiliary headlight connector.
Step 4. Check for +24 VDC between wire 42HR (1) and ground at auxiliary light
control switch (8).
If +24 VDC is present, repair wiring 42HR between auxiliary
headlight connector and auxiliary light control switch.
If +24 VDC is not present, go to step 5.
Step 5. Check for +24 VDC between wire 41HR (9) and ground at auxiliary light
control switch (8).
If +24 VDC is present, replace auxiliary light control switch
(page 4-1 46).
If +24 VDC is not present, go to step 6.
Step 6. Disconnect connector G (10) and check for +24 VDC between wire 41HR (9)
and ground.
If +24 VDC is present, repair wiring 41HR between
connector G and auxiliary light control switch.
If +24 VDC is not present, repair wiring 41HR between fuse
box 2 and connector G.

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