TM 5-3825-270-23&P
FIELD MAINTENANCE
GENERAL TROUBLESHOOTING INSTRUCTIONS
GENERAL
The troubleshooting included in this manual provides the information needed to isolate, diagnose, and correct
malfunctions incurred to the water distributor. Each fault symptom given for an individual component or system is
followed by step(s) leading to the cause of the fault and the actions needed to correct it. This manual cannot list all
faults that may occur, nor all test, inspections, or corrective actions. If a fault is not listed or is not corrected by listed
corrective actions, notify the supervisor.
BEFORE TROUBLESHOOTING
Before taking any action to correct a possible malfunction, follow these rules:
1. Ensure Operator Troubleshooting has been performed on the vehicle since the fault has occurred.
2. Ensure Operator PMCS was performed prior to, during, and after the mission that incurred the fault.
3. Obtain as much information from the operator as possible about the fault.
4. Check the repair history of the particular piece of equipment with fault.
5. Never overlook the possibility that the problem may be of simple origin and may be repairable with a simple
adjustment.
6. Use all of your senses to observe and locate problems.
7. Whenever possible, isolate the system first and then the component causing the fault.
8. Use standard automotive theories and principles when troubleshooting this piece of equipment.
TROUBLESHOOTING ELECTRICAL SYSTEMS GENERAL
The voltage and current for the electrical system are indicated by a battery gauge located on the main control panel.
A circuit breakers located side of the main control panel to protect the main circuits. Electrical power is provided by
two 12-volt batteries connected in series. Power is distributed throughout the water distributor by wiring harnesses.
The harnesses are interconnected by pin connectors, terminal strips, and/or wire terminals.
Use jumper wires when applicable to aid in isolating faults during troubleshooting. Use a standard multimeter to
troubleshoot circuits.
WHEN TROUBLESHOOTING ELECTRICAL SYSTEMS
Look for the following:
1. Inspect wires for loose electrical connections.
2. Inspect connectors for loose, bent, or corroded terminals.
3. Tag and mark wires and connectors prior to removal.
4. When applicable, remove and replace cable ties.
5. When checking for continuity using multimeter, less than 2 ohms represents continuity. When testing through
components or through multiple harnesses the allowable resistance tolerance is given in troubleshooting
test.
6. When testing wires inside control panel, it may be easier to touch multimeter probes to terminal strip screws.
Removal and installation of wires at terminal strips can often be time consuming.
7. Ensure wires at terminal strips are fully seated and not frayed before taking multimeter checks. Unseated
or frayed wires can result in improper multimeter readings.
TROUBLESHOOTING RULES
When performing troubleshooting, follow these rules:
1. Caution must be used when working around the alternator, starter, NATO slave receptacle, or circuit
breakers when the battery is connected. These components have 24-volt terminals that will still be live.
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