Small Engines (Lawn Mowers, etc.): dreaded JD 116h charging issue, diode module, stator


Question
I just picked up an old JD 116h mower that has the seemingly all too common problem that it won't keep the battery charged.    The mower has a Briggs 402707-0131-01 engine. The present setup still works, but will not hold a charge when checked with a multimeter.   The battery is about 12.6 with engine off, and might bump up to 12.75 when the mower is running, but that is about it.   

From the research I have done, the stock 9v stator just can not keep up to the mower with lights, battery and electric pto.

Right now, I have the stock one wire 9v stator. This one wire runs to a diode module where it pigtails off to the lights which has a diode on it to drop the lights to 5vdc.   

I would like to upgrade to the 16v stator that is available for this mower/engine, but am not sure what I would have to do to wire it up so it all works.  It looks like there is a two wire option and a one wire option with the 16v stator.   If I buy the one wire version, could I just replace the stock one, or would that burn something up?   thanks,  

Answer
If this is the stock stator it should work unless there have been modifications made. You should check the stator for it's output. The stator should put out 30 volts a/c and it transformed to d/c by the rectifier. The rectifier should put out 13.5 to 14 volts.