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WINDSHIELD WIPERS WILL NOT OPERATE.
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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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WINDSHIELD WIPERS WILL NOT OPERATE. cont'd -680640260
TM 5-2420-224-20-1
Table 3-5. Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
ELECTRICAL SYSTEM (CONT)
Step 3. Check for +24 VDC between wire 632 (7) and ground at windshield
wiper/washer switch (5).
If +24 VDC is not present, repair wiring 63 between windshield
wiper/washer switch and fuse box 1.
If +24 VDC is present, go to step 4.
Step 4. Check for +24 VDC between wire 632 (7) and ground at windshield
wiper/washer motor connector (8).
If +24 VDC is not present, repair wiring 632 between
windshield wiper/washer motor and windshield wiper/washer
switch.
If +24 VDC is present, go to step 5.
Step 5. Check for +24 VDC between wire 631 (9) and ground at windshield
wiper/washer switch (5).
If +24 VDC is not present, replace windshield wiper/washer
switch.
If +24 VDC is present, go to step 6.
Step 6. Check for +24 VDC between wire 631 (9) and ground at windshield
wiper/washer motor connector (8).
If +24 VDC is present, replace windshield wiper/washer motor
(page 4-477).
If +24 VDC is not present, repair wiring 631 between
windshield wiper/washer switch and windshield wiper/washer
motor. If problem continues, go to step 7.
NOTE
For steps 7 and 8, windshield wiper/washer switch must be pulled out twice to activate
delay/intermittent operation.
Step 7. Check for +24 VDC between wire 635 (10) and ground at windshield
wiper/washer switch (5).
If +24 VDC is not present, replace windshield wiper/washer
switch.
If +24 VDC is present, go to step 8.
Step 8. Check for +24 VDC between wire 635 (10) and ground at windshield
wiper/washer switch relay connector (11).
If +24 VDC is present, replace windshield wiper/washer switch
relay (page 4-140).
If +24 VDC is not present, repair wiring 635.
3-129

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