I dont know what is normal for that tractor but, 15.25V is a bit high for a 12.6V battery. I like mine at 14.8 max, as long as it it is no higher then 15.25V it should not shorten the battery life by much, if you have a serviceable battery, just make sure it does not get low on fluid, be sure to use distilled water to top off & dont overfill it.
Measure at the battery? You might try cleaning the electrical connections & the VR. ground.
Maybe someone more knowledgeable on the 214 will chime in.
My 400 will drain the battery with a 12 hour night sesion with the healights on. Never any problem with running it during the day. One of these days I'll get around to checking what my voltages are.
