Kohler Command 20hp 15amp voltage regulator - I had two of these go in one day - on different machines. I haven't blown one up in 10 years. Nothing is different - haven't made any adjustments or changes to these machines (exmarks). Anyone have any ideas on why they blow? Just thought it was very odd. What usually causes these to blow anyway? I just want to make sure that I treat the problem and not the symptom - thanks!