no, I have not opened them up as I do not want the store (advance auto) to think I have been tinkering with it and that is what made it fail.
my thought is this: old one not working, install a new one and it works, then the charging system is working on the old tractor, problem is just the voltage regulator.
I will ask about the select series today when I go in and tell them to order me another one.
they want the old one back when you pick up the new one. store policy