TM 5-3825-230-14&P
Table 4-3. Unit Troubleshooting - CONT.
Malfunction
Test or Inspection
Corrective Action
ELECTRICAL SYSTEM
NOTE
Refer to Appendix H for electrical schematics to aid in troubleshooting the electrical system.
1. BATTERY WEAK OR FAILS TO MAINTAIN CHARGE.
Step 1. Attach a multimeter between positive battery terminal of right battery and a good frame ground.
Check that battery produces 24 volts with engine switch on.
If not, service battery (para 3-11).
Step 2. Check for loose, corroded or damaged battery cables and posts.
Repair broken wires or connectors (para 4-83).
Step 3. Check battery cables and alternator wiring for continuity.
Replace or repair broken wires or connectors (para 4-81 or 4-83).
Step 4. Test alternator (para 4-57).
Replace alternator regulator as necessary (para 4-57).
2. ONE OR MORE LIGHTS NOT WORKING.
Step 1. Connect 12V wiring harness to tow vehicle. Make visual check for burned out light bulb.
Replace light bulb (para 4-68, 4-69, or 4-71).
Step 2. Check socket and/or contacts for corrosion.
Step 3. Check for proper ground.
Clean ground connection.
Step 4. Turn light switch on and check for voltage.
If there is voltage, replace defective lamp or bulb.
Step 5. Check wiring for loose connections or broken parts.
Repair or replace wiring or broken parts (para 4-79 or 4-83).
Step 6. If lights still do not work, notify supervisor.
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