afakhori

Thanks! Do you guys know of a definitive way to test the alternator?

Hey All, New to the forums. My wife has an 07 RX350 and two days ago she called me telling me the battery light was on, then 5 min later she said it wouldnt even start. I go pick her up and pull the battery and have it tested. O'reilly's says it wouldnt even hold a charge. Since it was the original battery I assumed it was just time for a new one. So I picked up a battery from costco, dropped it in and it started fine. My wife drove to work the next day (about 15miles) and back home fine. As she was pulling onto our street the radio started cutting in and out, the windows stopped working and it started getting prettty sluggish. Pulled the (new) battery and had it checked, was told it was on its last legs of life. Something is draining this battery hardcore and fast, and I dont know how to figure it out. Has anybody experienced this before? Any help would be much appreciated.