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FRONT BLACKOUT 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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HORN WILL NOT SOUND. cont'd
TM 5-2420-224-20-1
Table 3-5. Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
ELECTRICAL SYSTEM (CONT)
33.
HORN WILL NOT SOUND.
NOTE
Vehicle MASTER disconnect switch must be ON, master light switch set to SER
DRIVE, and horn button depressed. Failure to do so will cause erroneous results.
Refer to wiring diagram for ail wiring repair steps.
Step 1.
Check for +24 VDC between wire 641 (1) and ground at horn (2).
If +24 VDC is present, replace horn (page 4-218).
If +24 VDC is not present, go to step 2.
Disconnect connector F (3) and check for +24 VDC between wire 641 (1)
Step 2.
and ground.
If +24 VDC is present, repair wiring 641 between connector F
and horn.
If +24 VDC is not present, reconnect connector F and go to
step 3.
Remove two clamps (4) and intake pipe (5).
Step 3.
Step 4.
Loosen two captive screws (6) and pull bracket (7) out enough to gain
access to area behind bracket.
Step 5.
Disconnect connector AD (8) and check for +24 VDC between wire 641 (1)
and ground.
If +24 VDC is present, repair wiring 641 between connector AD
and connector F.
If +24 VDC is not present, go to step 6.
With connector AD (8) disconnected, check for +24 VDC between wire 64
Step 6.
(9) and ground at connector AD.
If +24 VDC is present, replace horn, low beam/high beam
switch (page 4-215).
If +24 VDC is not present, reconnect connector AD and go to
step 7.
Step 7.
Check for +24 VDC between wire 64 (9) and ground at fuse box 1 (10).
If +24 VDC is not present, replace fuse.
If +24 VDC is present, repair wiring 64 between fuse box 1
and horn, low beam/high beam switch.

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