TM 5-3805-258-24-1SYSTEMS OPERATIONOPERATOR’S STATIONINDIVIDUAL CIRCUIT DESCRIPTIONB. Engine Coolant TemperatureThe engine coolant temperature circuit has a normally closed 7N9785 Tem-perature Switch that opens if the coolant temperature goes above 107°C(225°F). If the switch opens, the coolant temperature indicator on the operatorpanel turns ON. The operator panel also sends current to turn ON the masterfault light. The engine coolant switch circuit connects to Pin 6 of the operatorpanel. Pin 11 of the operator panel goes to the master fault light.ENGINE COOLANT TEMPERATURE1. Engine coolant temperature switch.Engine Coolant Temperature Circuit3-155
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