Quantcast DRIVER SIDE WINDSHIELD HEATER WILL NOT OPERATE. cont'd -680640288

 

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DRIVER SIDE WINDSHIELD HEATER WILL NOT OPERATE. cont'd -680640287
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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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DRIVER SIDE WINDSHIELD HEATER WILL NOT OPERATE. cont'd -680640289
TM 5-2420-224-20-1
Table 3-5. Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
ELECTRICAL SYSTEM (CONT)
Step 7. Check for +24 VDC between wire 622 (7) and ground at relay K5 (6).
If
+24
VDC
is
not
present,
go
to
step
9.
If
+24
VDC
is
present,
go
to
step
8.
Step 8. Check for +24 VDC between wire 622 (7) and ground at windshield heater
(8).
If +24 VDC is present, notify direct support maintenance.
If +24 VDC is not present, repair wiring 622 between
windshield heater and relay K5.
Step 9. Check for +24 VDC between wire 626 (9) and ground at relay K5 (6).
If +24 VDC is present, replace relay K5.
If +24 VDC is not present, go to step 10.
Step 10. Check for +24 VDC between wire 626 (9) and ground at relay K4 (10).
If +24 VDC is present, repair wiring 626 between relay K4 and
relay K5.
If +24 VDC is not present, go to step 11.
Step 11. Check for +24 VDC between wire 62 (11) and ground at relay K4 (10).
If +24 VDC is present, replace relay K4.
If +24 VDC is not present, repair wiring 62 between relay K4
and fuse box 2.
3-158

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