Small Engines (Lawn Mowers, etc.)/JD LX255 not charging

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Question
My Fathers 1999 LX255 had the battery light come on when mowing and he would have to charge it up to start mowing next time.  His battery is 1 year old.  I got new Kohler Stator (alternator) and replaced it, no change.  I got a new voltage regulator and replaced it, still no change.  Brought it to my house and tried the sequence with a charged battery (12.2).  I started and ran 5 min at a time for 3 different days, never over 12.3V.  Mowed tonight.  Five min into the mow the battery light came on and I checked it at 11.9V.  Continued to mow for 2 hours, light still on and voltage down to 9.8V, it does drop to 9.7V with the deck on.  Everything looks "right" and it mows very well, it just is not putting back the needed voltage.  Where do I look next?  Thanks

Answer
Have you check the message boards?  JD is very stingy with service manuals but I have see very similar questions with JD mowers.

You should check the electric clutch to make sure it is not drawing too much current and pulling the voltage down.

Did you dis-connect and clean the battery terminals and cable ends with a wirebrush?  I have fixed a lot of charging issues just by cleaning the connections even though they looked clean.

Did you download the Kohler engine service manual and check the stator and regulator output voltage?

Let me know.
Eric

Small Engines (Lawn Mowers, etc.)

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Eric A. Jones

Expertise

Lawnmower Repair . Certified Master Service Technician from B&S. Have 23 years experience on B&S, Lawn Chief, Weed Eater, Echo, Peerless, Wheel Horse, Snapper, Atlas, MTD, McCulloch, Homelite and many other numerous brands. Specialize in electrical repair.

Experience

Born and raised in the midwest. Started tinkering with engines when I was about 14 on my Suzuki RM-80. I began lawn mower repair at a small hardware store. I knew absolutely nothing. I read lots of repair manuals and met an older fellow who taught me many lessons. I continued working on small engines through high school and paid my way through college working on mowers at the same hardware store. Decided to get away from the midwest and mower repair so I joined the Air Force. I repaired air traffic control electronic equipment and ended up in Hawaii where I got a part time job at Small Engine Clinic. I gained a lot of experience from the Small Engine Clinic and had a blast repairing small engines. I then took the Briggs and Stratton Master Service Technician test and earned my MST. I then traveled to Wisconsin where I attended the factory update training seminar and received formal training. Continued working on mowers part time as I completed 20 years of military. Retired from the military on a Friday and continued in the lawn and garden industry the next Monday.

Education/Credentials
MAS Aerospace Operations BA Mathematics AAS Electronic Communications AAS Electronic Technology

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