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COOLING SYSTEM -680640217
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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) -680640219
TM 5-2420-224-20-1
Table 3-5. Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
ELECTRICAL SYSTEM
WARNING
When replacing fuses, make sure only fuses of correct amperage are
i n s t a l l e d . Failure to do so could result in injury to personnel or damage to
equipment.
NOTE
Before starting troubleshooting, check for bad wire connections, blown fuses, and
proper switch settings.
During troubleshooting of circuits containing lamps, fuses, or relays, first check
problem by replacing lamp, fuse, or relay with known good lamp, fuse, or relay.
This may save time and effort.
During troubleshooting, check all wiring In a circuit for damage (e.g., cuts, wear,
bubbling, burning, etc.).
Before performing voltage checks, make sure equipment is properly set up (e.g., to
check for voltage at turn signal, make sure vehicle MASTER disconnect switch and
ignition switch are ON and turn signal lever is switched to L or R position).
17. NO ELECTRICAL POWER.
NOTE
Refer to wiring diagram (page 3-90) for all wiring repair steps.
Step 1. Check batteries (TM 5-2420-220-10).
If batteries are bad, charge (TM 5-2420-224-10) or replace
(page 4-219) batteries.
If batteries are good, go to step 2.
Step 2. Check for +24 VDC between positive battery terminal (1) and negative
battery terminal (2) on batteries (3).
If +24 VDC is not present, repair interbattery connect cable (4).
If +24 VDC is present, go to step 3.
Step 3. Check for +24 VDC between positive battery cable (5) at frame positive stud
(6) and ground at negative battery terminal (2).
If +24 VDC is not present, repair positive battery cable.
If +24 VDC is present, go to step 4.

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