Three weeks to the day I picked up my tractor from the dealer. They found a relay bad # M808087. They told me it is under the plastic cover by the steering column on the right side, second one back from the front. They found 28volts coming out of the alternator, 28volts going into the voltage regulator but none coming out. Thy tried a new voltage regulator (even though I put a new one on) and same thing. That's when they found the relay bad. I now have 13.36 volts half throttle and 13.49 at full throttle. Even when running all the lights I never go below 13.04 volts. The bad news... they are not sure if that will fix the draining issue! I have a FLAMMING river disconnect switch so I'm not to worried about that since it will now charge while running! I'll try to post another update once I monitor it for a few weeks. I'm hoping all my troubles are behind me now and hope to help others with my findings. Man, it cost me $350! The stupid relay was $90.48. Good luck all!