No power when key is turned on a JD GX345. Just mowed after replacing the water pump. Coolant level is good, no warning lights ever came on. Battery tests @12 V.

Electric clutch may not be getting enough power. Check fuse. It may be getting power that is not sufficent from low battery. Check water level in battery, check power by turning lights on and cranking motor. If lights go very low then battery is suspect. If my JD battery gets very low it has to be charged with external charger as the JD charger cannot bring very low battery up and drive clutch too.

Is the Oil level correct. Too much oil in crankcase is NG

It says that your vehicle is low on coolant.Get the coolant level checked.If low has to be changed.

------------Check out few help links related to your issue.Click the link below:---


Service 4wd warning light on Dash? http://howtobyme.blogspot.com/2011/11/service-4wd-warning-light-on-dash.html

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Car Turns OFF due to low oil pressure warning light? http://schematicsdiagram.blogspot.com/2011/12/car-turns-off-due-to-low-oil-pressure.html

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Hybrid warning Light ON? http://whatisbyme.blogspot.in/2012/05/2005-toyota-prius-hybrid-warning-light.html

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Order Coolant Bypass Tube? http://whatisbyme.blogspot.in/2012/05/1991-toyota-camry-order-coolant-bypass.html

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Coolant Leak? http://technoanswers.blogspot.in/2012/04/1994-toyota-camry-coolant-leak.html

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COOLANT LEAK AT DRIVER SIDE NEAR FIREWALL? http://schematicsdiagram.blogspot.in/2012/04/2006-cadillac-dts-coolant-leak-at.html
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MAF, IAT, MAP and Coolant Level Sensor problem all together? http://schematicsdiagram.blogspot.com/2011/12/maf-iat-map-and-coolant-level-sensor.html

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Engine Coolant Temperature (ECT) Sensor Replacing? http://schematicsdiagram.blogspot.com/2011/12/gmc-engine-coolant-temperature-ect.html Loosing Coolant? http://whoisbyme.blogspot.in/2012/06/loosing-coolant.html
---------- Coolant temperature sensor dies again and again?

http://schematicsdiagram.blogspot.com/2012/01/coolant-temperature-sensor-dies-again.html
----------- Where to Add Coolant? http://repairhelpcenter.blogspot.in/2012/06/2000-daewoo-lanos-where-to-add-coolant.html
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------------ Blue Water Warning Light on Dash? http://whatisbyme.blogspot.in/2012/07/blue-water-warning-light-on-dash.html

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The engine is overheating! Check the coolant level to be sure it is full. Other checks will then be to make sure the water pump is working. With the engine overheating, you are not getting coolant moving through the engine, or your heater core for that matter. If the coolant level is good, I would go to the water pump/thermostat next.

SOUND LIKE BAD WATER PUMP.IF BATTERY LOW CHARGE LIGHT ON WATER PUMP BEARING COULD BE LOCKING UP DRAGGING DRIVE BELT DOWN ENOUGH TO SLOW DOWN ALTERNATOR TO KEEP BATTERY FROM CHARGING.REPLACE WATER PUMP AND THERMOSTAT.CHECK COOLANT LEVEL SEE IF ANTIFREEZE IN RADIATOR IS LOW. IF SO FILL COOLANT SYSTEM BACK TO NORMAL LEVEL SEE IF WATER PUMP WEEP HOLE LEAKING WHILE ENGINE RUNNING IF SO WATER PUMP IS BAD.

check you radiator fluid it is low

3.2L & 3.5L Engines

1. Before servicing the vehicle, refer to the Precautions section.
2. Drain the cooling system.
   WARNING Do not use pliers to open the plastic drain.
   
3. Remove or disconnect the following:
   NOTE It is good practice to turn the crankshaft until the No. 1 cylinder is at Top Dead Center (TDC) of its compression stroke (firing position).
   Negative battery cable Coolant recovery cap and open the thermostat bleed valve Drive belts Timing belt Water pump mounting bolts, noting the position of the longer bolt Water pump. Discard the O-ring seal.
4. Clean the gasket sealing surfaces, being careful not to scratch the aluminum surfaces.
   
   
   Fig. Water pump bolt locations, make sure to note the position of the longer bolt
   

To install:

1. Install or connect the following:
   WARNING Rotate the pump and check for freedom of movement.
   New O-ring and wet with clean coolant prior to installation. Be sure to keep the new O-ring free of any oil or grease. Water pump with a new O-ring. Torque the water pump-to-engine bolts to 105 inch lbs. (12 Nm). Timing belt Drive belts
2. Fill the cooling system by performing the following procedure:
   1. Close the radiator drain.
      
   2. Open the thermostat bleed valve. Install a 1 / 4 in. (6mm) clear hose about 48 in. (1.2m) long to the end of the bleed valve and the other end into a clean container. The intent is to keep coolant off of the drive belt(s).
   3. Slowly, refill the coolant recovery bottle until a steady stream of coolant flows out of the thermostat bleed valve. Gently squeeze the upper radiator hose until all of the air is removed from the system.
   4. Close the bleed valve and continue to fill the coolant recovery bottle to the proper level. Install the cap on the bottle and remove the hose from the bleed valve.
3. Reconnect the negative battery cable. Start the engine and allow it to reach normal operating temperatures.
4. Check the cooling system for leaks and correct coolant level.
   WARNING Be sure that the thermostat bleed valve is closed once the cooling system has been bled of any trapped air.

Good luck (remember rated this).

If it has a coolant level sensor in the radiator yes it will, due to low on coolant due to water leaking from water pump, coolant will leak from water pump if bad, unless it just has bad water pump bearing's, then some time's it will not leak and just make a noise.

Add Coolant to spherical reservoir at right rear of engine compartment as viewed from front. If it is low the coolant gauge flashing light will warn you of a low condition.

There was a time when my JD just quit and did nothing. After doubting the battery that is what it was-the battery. Jump start your JD and if it starts up then your battery needs replaced.