I have a 2000 GT with 105k miles on it, all original, no aftermarket parts. While driving home the other night, the battery light on the dash came on. Everything was fine for a while, but eventually the lughts went dim and the voltage guage dropped all the way down. The car eventually died and I had to have it towed home. I thought initially it was the alternator, so I took it out and had Advanced Auto Parts test it. They said it tested fine and had good output. The battery is original, so I suspected it needed to be replaced anyway. Had Advanced test the battery - it failed. I put in a new battery and replaced the connection on the + battery cable since it was badly corroded and essentialy snapped when I removed it. The new connection I put on screws on to the OEM cable and seems to have a nice solid connection. I checked all other connections and put everything back together. Started the car and everything seemed fine and shut it down after running for about 2 minutes. Went back a couple of hours later and started the car and the battery light on the dash is on again. A new alternator was $200, so I don't want to just guess that this needs to be replaced. What does the battery light acutally indicate? I searched this forum for threads, but could not find anything relevant. Thanks in advance for responses.