My wife's Lexus ES350 barely madeithome
 

The other day my wifesaid her car died at a traffic light. She did get it started but coming up a hill she said she had to keeppatting the gaspedal tokeepit running. I wiwent out and checked and the battery light was on. I replaced the battery. It was still on. I have removed the alternator and will have it checked tomorrow. She alsosaid alight with the letters VSC came on. What would that be?