Ok I have 1999 Chevy Prism. Now today I went outside to start my car and it wont turn over at all. So I thought I had left something on and my battery died, so I had my neighbor give me a jump, but still it wouldnt turn over. Now Im not sure if I need a new battery or a alternator. I took my multimeter and tested the battery and it read 12.54 volts without the any accessories such as lights, radio, etc on. Then when I turned the lights on the multimeter read 11.26 volts. Im not sure if it a battery, alternator, or maybe even a starter, so does anyone have an idea?