Small Engines (Lawn Mowers, etc.): riding lawn mower electrical problem, hurricane katrina, ac volts

Question
I have a John Deere riding lawn mower. It has a 25 hp Kholer engine. My problem is that when I engage the PTO the yellow light comes on that indicates the engine is not charging. I also have to hook up a battery charger to charge the battery about once per month. Just a little background that may help you with my question. My mower went under 12 feet of salt water from Hurricane Katrina. I replaced the battery, starter and regulator. I used a volt meter to check the voltage while the engine is running and I get a -12 volts. Can you help with me issue? Also, thanks for help with removing my PTO.

Answer
Hello Oliver:

>>For Testing the Electrical (Charging) System on Mowers you can Use this Site Addy; http://faqs.custhelp.com/cgi-bin/faqs.cfg/php/enduser/std_adp.php?p_faqid=3438&p... and Use the Link for AC Volts/DC Amps Meter Setting Chart. This is for Briggs Engines and Works Well for Kohler and Other Engine OEMs.
>>From your Description it Sounds like the Stator/Charging Coils are Not Charging Correctly
>>The Voltage with the Engine Running at Full Throttle Just After Starting should be 12.5 VDC to 14.5 VDC.
>>If you Hit a Snag or this Does Not Correct the Problem,  I am Here if You Require More Assistance. Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Be Safe and Happy. Thanks.

Good Luck

Respectfully

John

PS: I am Allowed to Answer 10 Questions a Day. If you See I am Maxxed Out, then Try Submitting your Question at or Just After 8pm EST (US). My New Day Starts then. Comments and Ratings are Greatly Appreciated. Thanks.

Respectfully

John