Hi, I have a 2004 Toyota Matrix with 270 000km. It's working great but today when i started my car the battery was going up to 17.2V (i have a battery voltage reader in the car at all time). It's the first time it went up there, it usually stays in the 13-14V. I know something is wrong and I want to fix it before it breaks something. I made some reasearch already and i read it could be the voltage regulator circuited between the alternator and battery. I don't know much about car's electrical system and my electric classes are a little bit far (still i am supposed to have some basic knowledge). So i'd like to know precisely what's the problem and how to fix it. Or some help or guidance, thanks alot for any help provided !!