TM 9-2330-359-14&P
Table 4-2. Organizational Troubleshooting (Con’t).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 3.
Step 4.
Step 5.
Check for defective lamps.
Replace defective lamps (para 4-21, 4-22, 4-23, 4-24, 4-25, or 4-26).
Check for defective contact in electrical receptacle or on plug of electrical connector on towing
vehicle.
Replace contact or electrical receptacles as required (para 4-28 or 4-19). Refer to towing
vehicle technical manual to replace or repair electrical connector.
Check nose box resistors for proper operation.
Replace faulty resistors (para 4-20).
3. DIM OR FLICKERING LIGHTS.
WARNING
When troubleshooting an electrical malfunction, ALWAYS disconnect towing vehicle
electrical connector from semitrailer. Failure to do so may result in serious injury or
death due to electric shock.
NOTE
Refer to wiring diagrams in paragraph 4-29 to determine routing of electrical wires and
location of electrical components.
Step 1.
Check for loose, dirty, and corroded terminals.
Clean and tighten terminals.
Step 2.
Check for poor or loose ground.
Clean and tighten terminals of ground wire of electrical receptacle in nose box (para 4-20).
Step 3.
Check for defective contacts in electrical receptacle or on plug of electrical connector on towing
vehicle.
Replace contact or electrical receptacles as required (para 4-28 or 4-19). Refer to towing
vehicle technical manual to replace or repair electrical connector.
4. BRAKES DO NOT RELEASE.
BRAKES
Step 1.
Check for restrictions in air lines and hoses.
Remove restriction or replace defective air lines and hoses (para 4-35 or 4-36).
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