TM 5-3805-258-24-19 5 0 B O P E R A T O R ’ S S T A T I O NE L E C T R I C A L T R O U B L E S H O O T I NGPROBLEM C: An Indicator That Must Be OFF, Is ON.Possible Causes: a. Bad switch (sensor).b. Bad ground wire to switch (broken wire or bad connec-tion).c. Bad control wire to switch (broken wire or bad connec-tion ).d. Bad operator panel.TROUBLESHOOTING1. Remove the control wire from the switch (sensor) and put it to machineground (See TABLE 3). The indicator must turn OFF.IT A B L E 3Control Wire ColorHarnesa Plug Socketat SwitchSwitchat Operator PanelYIPUHydraulic Oil Temperature4LT BLCoolant Temperature6Y/oITransmission Oil TemperatureI7GYIPLow Brake Oil Pressure2IT/O] FuelLevelI14Indicator Turns OFFIndicator Stays ONEither the switch or the ground is bad. Go to Step 2.There is either an open wire in a harness, or theoperator panel is bad. Go to Step 3.2. Check for continuity across the switch with an 8S4627 Circuit Tester.ContinuityNo ContinuityIf there is continuity across the switch, then theReplace the switch (sensor).ground for the switch is bad. Replace the harness orconnect another ground wire to the switch.3. Check for continuity through harnesses from the switch to the operator panel.Fasten the control wire for the switch to machine ground. Disconnect theharness plug from the operator panel and check for continuity at the plug socketthat is for the switch that is grounded (See TABLE 3). Use an 8S4627 CircuitTester.ContinuityNo ContinuityReplace the operator panel.Use the electrical schematic or simplified schematicto check through each harness between the switchand the operator panel, until the one with the brokenwire is found. Repair or replace the harness.4-113
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