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Old 04-28-2007, 05:59 PM
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Kohler 20hp charging question

I have a Kohler 20hp twin cylinder horizontal shaft motor in a 48" Walker mower. The engine would not turn over so I charged the batery and then load tested it. The battery failed the load test so I replaced it. The engine started right up but the voltmeter on the instrument panel is only reading slightly higher than 12 volts. I placed a voltmeter on the battery with the engine running and it is reading 12.6 volts. Is this acceptable? If not, what wires do I have to check to determine if the regulator is functioning properly.
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Old 04-28-2007, 06:33 PM
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When you performed the test was the engine at FULL throttle ?
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Old 04-28-2007, 06:47 PM
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Kohler charging

Restorob, thank you for the quick reply. The voltage at the battery went up less than a half of a volt from idle approx 3600 rpm. The max I could get from the charging system is 12.65. I checked all of the grounds and they are good.
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Old 04-28-2007, 07:29 PM
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Un-plug the voltage regulator and put your multimeter on AC volts, Put a test lead on each of the white wires. Start the engine and run at full throttle, You should get 28 or more volts.

If lower than 28 the stator is bad.

If you do get 28 or above AC volts check the ground wire/strap on the voltage regulator for corrosion, Also check for battery voltage on the center wire in the regulator plug with the key in the run position.

If stator test OK, Regulator ground is good and there is voltage to the center regulator wire replace the voltage regulator.
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Old 04-28-2007, 07:50 PM
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Thanks Restorob

Thanks so much Restorob. I will check this tomorrow. This is a great site and it is members like yourself that go above and beyond to help.
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Old 04-28-2007, 07:59 PM
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Thanks ericg !

It was no problem.....
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You never learn anything until you admit you don't know it all...

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Old 04-28-2007, 10:54 PM
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I worked on Walkers every day. Check the ground lead at the voltage regulator. Also with the engine off but the key in the run position check to see if you are getting 12 volts DC at the voltage regulator on the middle lead wire.
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Old 04-28-2007, 11:07 PM
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http://www.lawnsite.com/showthread.p...ohler+charging

This should help.
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Old 04-29-2007, 08:13 AM
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Quote:
Originally Posted by fixer67 View Post
Check the ground lead at the voltage regulator. Also with the engine off but the key in the run position check to see if you are getting 12 volts DC at the voltage regulator on the middle lead wire.

Quote:
Originally Posted by Restrorob View Post
check the ground wire/strap on the voltage regulator for corrosion, Also check for battery voltage on the center wire in the regulator plug with the key in the run position.
Hmmm.....Did I miss something here.
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Old 05-12-2007, 03:55 PM
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Finally repaired

I finally got the machine back from the dealer. He said that a leaking engine seal caused the stator to become shorted to ground. He replaced the stator, engine seal and regulator and charged me $300.00. He gave me the stator and showed me with an ohm meter that it was shorted to ground. Has anyone ever heard of a bad engine seal causing this problem with the stator? Again, thanks to everyone who responded to my post. This is a great site.

Eric
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