While I was driving today, I noticed that the headlights were beginning to dim out. A few minutes later, the TCC refused to engage, I believe that was because the battery was close to dead. Then the temperature gauge went dead...and then all of a sudden, everything came back to life, then went dead again.. This happened a few times and now the battery is completely dead and the car won't start because of that. What could be the reason? I thought it could be the alternator but then the battery light never lit up. All fuses are ok