TM 9-2330-359-14&PTable 4-2. Organizational Troubleshooting.MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTIONELECTRICAL SYSTEM1. ALL LAMPS FAIL TO LIGHT.WARNINGWhen troubleshooting an electrical malfunction, ALWAYS disconnect towing vehicleelectrical connector from semitrailer. Failure to do so may result in serious injury ordeath due to electric shock.N O TERefer to wiring diagrams in paragraph 4-29 to determine routing of electrical wires andlocation of electrical components.Step 1.Step 2.Step 3.Step 4.Check for unserviceable circuit breaker on towing vehicle.Replace defective circuit breaker. Refer to towing vehicle technical manual for instructions.Check for open circuit in wiring.Replace or repair wiring harness as required (para 4-27 or 4-28).Check for loose connections and good ground wire contact inside nose box.Clean and tighten connections.Check all electrical receptacles, connectors, and lamps for broken and defective components.Replace broken and defective components (paras 4-19 through 4-26).2. ONE OR MORE LAMPS (BUT NOT ALL) FAIL TO LIGHT.WARNINGWhen troubleshooting an electrical malfunction, ALWAYS disconnect towing vehicleelectrical connector from semitrailer. Failure to do so may result in serious injury ordeath due to electric shock.NOTERefer to wiring diagrams in paragraph 4-29 to determine routing of electrical wires andlocation of electrical components.Step 1.Check for broken wiring harness or loose connection.Tighten, replace or repair wiring harness (para 4-27 or 4-28).Step 2.Check for dirty or corroded lamp socket.Remove lamp and clean contacts and socket.4 - 7
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business
