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Craftsman Garden tractor
Model# 917275031

The battery is no longer being charged so after 45 minutes the electric to the mower deck cuts out and I can no longer mow (the switch is electric).

What part do I need to replace for the battery to be charged whilst the engine is running?

Thanks!
 

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The Magnificent
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20,952 Posts
Welcome from Spotsylvania Bzybee08.

You first need to diagnose your electrical system.
With the battery fully charged, what is its voltage? Matter of fact, just haul it to any auto parts store and have them load check it for you.

Next, get out your meter and check the output of the voltage regulator. You have a built in ammeter - is it showing a charge or discharge while the engine is running?

If the ammeter isn't working at all, you may just have a loose connection or blown fuse. Check out all the wiring and connectors.

This may help a bit:
http://www.searspartsdirect.com/partsdirect/getSubComp.pd?modelNumber=917275031&productCategoryId=1509200&brandId=0247&modelName=LAWN-TRACTOR&diagramPageId=00001&componentDescription=ELECTRICAL&documentId=P0103419&backToLink=Return to Sub Components list
 

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The Magnificent
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Thank you.. I will dig deeper this evening. I forgot to check the ammeter.

Out of interest though, what part of the tractor charges the battery?
I thought it might be
http://www.mfgsupply.com/m/c/SND0007.html?id=MDH8dJbI
but that appears to be just the starter..
Back in the day, there used to be a starter/generator that provided juice after starting the tractor.

Your Kohler has a stator, which is a ring of wire windings under the flywheel. The flywheel has magnets and it induces electrical current in the stator as it spins. Most modern ones produce AC current, which is frequently tapped for the headlights, then passed to a rectifier/regulator which converts to the correct DC charging voltage of 13.2-14.5 volts.
 

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Your engine is equipped with an alternator & Voltage regulator.

Download the proper Kohler service manual for the correct troubleshooting procedure.

http://www.kohlerengines.com/manuals/landing.htm

Your engine is a CV674-75544

In a nutshell-

Disconnect the 2 yellow leads from the alternator to the regulator.

With the engine running at high speed, you should have 28 VAC minimum. Note- that's AC!
IF you do, the alternator is good.

The regulator should convert the 28 VAC to ABOUT 14 VDC. (note DC)
 
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