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Kohler 15 Stator


dwcurry's Avatar
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12-21-06, 07:43 AM   #1  
Kohler 15 Stator

The stator on my Kohler 15 HP engine went bad apparently shorted out with burn marks. I have another one on order, but I was wondering if there are any areas that I need to check out as the root cause, or if these just go bad on their own.

 
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12-21-06, 09:00 PM   #2  
Generally, they don't go out like that on their own. I'd suspect voltage got to it and burned it up. It should only produce current, never recieve it. I would check the voltage regulator. Has the battery been connected backwards?

To check the regulator, there are 3 prongs on it. The 2 outside prongs should not have continuity to the middle prong if the positive lead of the ohmmeter is connected to the middle prong. there should be continuity the other way around though, with the negative lead connected to the center prong.


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12-22-06, 03:04 AM   #3  
Has the key switch been replaced recently? Have any of the wires been tampered with? Are any of the wires showing signs of rubbing and subsequent bare spots?

 
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12-22-06, 05:29 AM   #4  
Thanks for the feed back, I'll check out the VR. As to the switch, I don't know as my son picked the unit up used with the electrical problem already existing. I'm trying to get it into shape for him. Any suggestions as to how to confirm that I have a good switch? The engine is on a Sears Craftsman 46" lawn tractor.

 
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12-23-06, 09:29 PM   #5  
The diode in the regulator/rectifier should protect the stator in all cases, except for reverse polarity from the battery. If the switch was grounding the charging wire (the center wire on the connector to the regulator), it could cause the stator to send current to ground, making it get hot and burn out. I don't recall for sure, but I think this mower has a relay that wouldn't allow the switch to do that unless some major monkey business was done with the wiring harness. In any case, make sure the center wire on the regulator connector is not grounded when the key is on, and it needs to have battery voltage on it with the key on.

Usually when I see a stator burned like this, it's because someone connected the battery backwards.


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12-25-06, 01:55 PM   #6  
Cheese Wrote:
Usually when I see a stator burned like this, it's because someone connected the battery backwards.



If this is the case, most likely the ignition Module(coil) is burned out also.
Check the wiring going to, and connected to the stator for blistering a exposure.

 
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12-26-06, 08:26 AM   #7  
The new stator has not arrived yet. We removed the old one, check all the connections and the VR and they looked Okay. We then charged the battery and started the engine and mowed the yard. So, I'm hopeful that the previous owner just connected the battery wrong and burned out the stator. When the new stator gets in we plan on going ahead and hooking it up and trying everything out again. Hopefully the batter will charge on its own with the new stator connected.

Thanks for all the advice.

DWC

 
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12-27-06, 12:07 AM   #8  
Anytime! Let us know how it works out!


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12-31-06, 06:46 AM   #9  
Stator installed and lawn tractor is working great.

Thanks,

DWC

 
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12-31-06, 05:29 PM   #10  
Great! Thanks for the update!


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08-20-09, 09:33 PM   #11  
15 kohler

My 42" craftsman rider died this summer after a hard mow. It eventually started but died again. After 10 days of non-use and a lot of rain about every day - I tried to start the mower and discovered it was not firing. I purchased a coil but when I tried to hook up the battery the negative cable wanted to weld. I traced out the circuit and found a burned (diode) area going to the stator. i unplugged the nearest plug and the short ceased. One at a time i jumpered the four wires and found the black lead going to the stator was the problem after i had cut out the bad diode.

Do i just need a diode or will i need a new stator? The old diode looks pretty well shot. NOTE - I jumpered the black stator lead to the male side of the plug after having removed the diode and the short was there - negative cable trying to weld to battery post.

 
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08-20-09, 11:57 PM   #12  
There will be a short without the diode. There won't with the diode. That may be all you need, but if it let the stator get too hot, it will have burned off the insulation on it and shorted out and won't charge the battery. You can crank up the engine, run it full throttle, and check AC voltage on the wire that had the diode. If you have significant AC voltage (probably over 15 volts AC), then the stator is probably still good.


"Who is John Galt?" - Ayn Rand (Atlas Shrugged)

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