My car has quite some high mileage and I've read in places that the alternators are known to fail on them. The car is 12+ years old with 190k miles (not km) So i can either chnage the alternator out which isn't cheap or keep with it until it fails. Right now I haven't had any issues with it. Car can sit in the freezing cold for a week and starts up fine and then an 30min to 45 min drive seems to charge it enough for it to start up again properly. I hear that some auto parts stores can test alterntors. Is there any special way to test if an alternator is still functioning normally or if its on its way out? Can I not just use a multimeter? I read that measuring voltage on the battery terminals with car off should read about 12 point something and with car on and accessories like AC and headlights turned off it should read over 14 volts. Is this a good test?