Textron Jacobsen HR-5111, Technical/Repair Manual

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4-68 4203780 First Edition
ELECTRICAL
4
Symptom: Charge filter pressure light is on with the key switch in the run
position (engine off).
Symptom: Charge filter pressure light is on with the key switch in the run
position (engine on).
Symptom: Engine temperature gauge indicates a temperature when the engine is cold.
Symptom: Engine temperature gauge does not indicate a temperature.
Symptom: Engine coolant temp light does not turn on.
Symptom: Engine coolant temp light turns on when engine is cold.
Probable Cause Remedy
Faulty charge filter pressure switch. Replace charge filter pressure switch.
Probable Cause Remedy
Blocked hydraulic filter. Replace hydraulic filter.
Faulty charge filter pressure switch. Replace charge filter pressure switch.
Probable Cause Remedy
Faulty engine temperature sensor. Replace engine temperature sensor.
Faulty ground circuit. Check continuity between the engine temperature gauge and ground. Continuity must be
indicated.
Probable Cause Remedy
Faulty engine temperature sensor. With a jumper wire, connect the engine temperature sensor to ground. With the key
switch in the run position, check the gauge. If the gauge is indicating full scale, replace
the engine temperature sensor.
Faulty engine temperature circuit. Check continuity between engine temperature gauge lt grn wire terminal and the engine
temperature sensor terminal. Continuity must be indicated.
Faulty switched power circuit. With the key switch in the On position, measure voltage between engine temperature
gauge org terminal and ground. Voltage must be approximately 12 VDC.
Faulty ground circuit. Check continuity between engine temperature gauge blk wire terminal and ground.
Continuity must be indicated.
Faulty engine temperature gauge. Replace the engine temperature gauge.
Probable Cause Remedy
Faulty engine coolant temp switch. With a jumper wire, connect the engine coolant temp switch terminal to ground. With the
key switch in the run position, check the engine coolant temp light. If the light turns on,
replace the engine coolant temp switch.
Faulty wiring. Check continuity between engine coolant temp switch grn wire terminal and the engine
coolant temp light. Continuity must be indicated.
Probable Cause Remedy
Faulty engine coolant temp switch. Disconnect the engine coolant temp switch terminal. With the key switch in the run
position, check the engine coolant temp light. If the light turns off, replace the engine
coolant temp switch.
Faulty wiring. Check ground short on engine coolant temp switch grn wire.