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.Check for continuity in each wire of intervehicular cable. There should be continuity. Check forcontinuity between pins/sockets at connector plug ends. There should be no continuity.Replace damaged intervehicular cable.Disconnect intradolly cable from forward junction box and rear junction box (see paragraph 2-7).Check for damage to receptacle connectors at forward junction box and rear junction box.Replace damaged receptacle connectors (see paragraph 4-35 and 4-37).Check for continuity in each wire of intradolly cable. There should be continuity. Check forcontinuity between pins/sockets at connector plug ends. There should be no continuity.Replace damaged intradolly cable.Check ground wires in signal conditioning box, forward junction box, and rear junction box toensure that they are secure. Check for looseness and damage to terminal blocks and wires insideboxes.Clean and tighten ground wires and other components as required (see paragraph 4-34,4-35, and 4-37).Disconnect intervehicular cable from towing vehicle and signal conditioning box (seeparagraph 2-7). Check for continuity in wires between J1 receptacle connector in signalconditioning box and J3 receptacle connector in forward Junction box. Check also for continuitybetween J2 receptacle connector in signal conditioning box and J3 receptacle connector.NOTECircuits containing voltage reducers will reflect high resistance in one direction.Reversing multimeter leads will result in low resistance.When continuity in a circuit between J1 or J2 receptacle connector and J3 receptacleconnector is not present, check for continuity across terminals of circuit breaker insidesignal conditioning box. If there is no continuity, replace circuit breaker (seeparagraph 4-34).Step 8.Check for continuity from circuit breaker inside signal conditioning box to TB1 terminal blockinside forward junction box. Check for continuity from TB1 terminal block to J3 receptacleconnector.Replace damaged signal conditioning box-to-forward junction box cable assembly (seeparagraph 4-46) or repair damaged forward junction box (see paragraph 4-35).Step 9.If malfunction persists, perform voltage check across terminals of all circuit breakers.If voltage is not present, replace circuit breaker (see paragraph 4-34).4-29
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