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PASSENGER SIDE WINDSHIELD HEATER WILL NOT OPERATE. cont'd -680640292
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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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HAZARD WARNING LIGHTS WILL NOT LIGHT. cont'd -680640294
TM 5-2420-224-20-1
Table 3-5. Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
ELECTRICAL SYSTEM (CONT)
50. HAZARD WARNING LIGHTS WILL NOT LIGHT.
NOTE
Vehicle MASTER disconnect switch must be ON, ignition switch set to ON, master
light switch set to SER DRIVE, and hazard warning switch depressed. Failure to do
so will cause erroneous results.
Perform the following steps only after proper operation of turn signals has been
verified.
Refer to wiring diagram (page 3-166) for all wiring repair steps.
Remove hazard warning switch (1) and check for +24 VDC between wire 45
Step 1.
(2) and ground.
If +24 VDC is not present, repair wiring 45 between hazard
warning switch and fuse box 1.
If +24 VDC is present, go to step 2.
Step 2. Check for +24 VDC between wire 451 (3) and ground at hazard warning
switch (1).
If +24 VDC is not present, repair wiring 451 between hazard
warning switch terminals 15 and 30.
If +24 VDC is present, go to step 3.
Step 3. Check for +24 VDC at wire 46 (4) and wire 452 (5) and ground at hazard
warning switch (1).
If +24 VDC is not present, replace hazard warning switch.
If +24 VDC is present, go to step 4.
Step 4.
Check for +24 VDC between wire 461 (6) and ground at turn signal flasher
relay (7).
If +24 VDC is not present, replace turn signal flasher relay
(page 4-196).
If +24 VDC is present, go to step 5.
Step 5. Check for +24 VDC between wire 461 (6) and ground at hazard warning
switch (1).
If +24 VDC is not present, repair wiring 461 between turn
signal flasher relay and hazard warning switch.
If +24 VDC is present, go to step 6.

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