TM 9-2330-390-14&PTable 4-2. Unit Troubleshooting (Con't).MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTIONStep 3.Step 4.Step 5.Step 6.Step 7.Step 8.Step 9.Step 10.Check for damage to connector plug(s) of affected light.Repair damaged connector plug(s) (see paragraph 4-26).Trace Circuit between connector plug(s) at affected light and TB2 terminal block inside rearjunction box (rear dolly light malfunction) or circuit breaker Inside signal conditioning box (frontdolly light malfunction). Check for continuity and loose or damaged wires between affected lightand rear junction box or circuit breaker inside signal conditioning box.Tighten any loose components, connections, and ground wire. If there is no continuity,replace damaged cable assembly (see paragraph 4-47, 4-48, or 4-49).If malfunction is on rear dolly, trace circuit between TB2 terminal block inside rear junction box andcorresponding pin of J4 receptacle connector. Check for continuity and loose or damaged wires.Check ground wire at pin D of J4 receptacle connector for looseness.Tighten any loose components, connections, and ground wire. If there is no continuity,replace damaged J4 receptacle connector and cable assembly (see paragraph 4-37).If malfunction is on rear dolly, check for continuity in wire of intradolly cable that corresponds tomalfunctioning lamp. There should be continuity. Check for continuity between pins/sockets atconnector plug ends. There should be no continuity.Replace damaged intradolly cable.If malfunction is on rear dolly, trace circuit between pin at J3 receptacle connector and TB1terminal block inside forward junction box. Check for continuity and loose or damaged wires.Check ground wire at pin D of J3 receptacle connector for looseness.Tighten any loose components, connections, and ground wire. If there is no continuity,replace damaged J3 receptacle connector and cable assembly (see paragraph 4-35).If malfunction is on rear dolly, trace circuit between TB1 terminal block in forward junction box andcircuit breaker in signal conditioning box. Check for continuity and loose or damaged wires.If there is no continuity, replace damaged signal conditioning box-to-forward junction boxcable assembly (see paragraph 4-6).Check for continuity in wire of intervehicular cable that corresponds to malfunctioning lamp. Thereshould be continuity. Check for continuity between pins/sockets at connector plug ends. Thereshould be no continuity.Replace damaged intervehicular cable.Check for continuity across terminals of circuit breaker on affected circuit.If there is no continuity, replace damaged circuit breaker (see paragraph 4-34).4-31
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