TM 9-2330-390-14&PTable 4-2. Unit Troubleshooting (Con’t).MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTIONStep 11.Check for continuity in wires between J1 or J2 receptacle connector in signal conditioning box andcircuit breakers.If there is no continuity, replace damaged J1 or J2 receptacle connector or repair damagedwires (see paragraph 4-34).Step 12.If malfunction persists, perform voltage check across terminals of all circuit breakers.If there is no voltage, replace damaged circuit breaker (see paragraph 4-34).4.DIM OR FLICKERING LAMPS.NOTEDim or flickering lamps are most often caused by loose or corroded connections.Check for these conditions while performing troubleshooting test and inspections.Check that affected lamp is not loose in light socket (see paragraph 4-38, 4-39, 4-40, or 442).Securely install lamp in light socket (see paragraph 4-38, 4-39, 4-40, or 4-42).Perform steps 2 through 12 of Malfunction 3, One or More Lamps (But Not All) Fail to Light.5.ONE OR MORE LAMPS BURN OUT FREQUENTLY.NOTEIf one or more lamps burn out frequently or immediately after replacement, a probablecause is a failed voltage reducer inside signal conditioning box.Step 1.Inspect voltage reducer on affected circuit inside signal conditioning box for loose ordisconnected wires.Connect and tighten wires.Step 2.With intervehicular cable connected and towing vehicle power on (see paragraph 2-11), checkvoltage at output of voltage reducer on affected circuit. Voltage should be 12 v.Replace damaged voltage reducer (see paragraph 4-34).4-32
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