A few days ago my car wouldn't start. I tried to jump it, and it wouldn't even work. Naturally, I figured it was the alternator. So had a new one installed. It worked great for that night and following morning, then the same problem occurred and my car would not start. I was told it might have been a bad alternator or battery. The battery was tested and it was fine, and I had a different alternator installed and returned the other one I purchased. Again, my car started perfectly and worked until a few hours ago. The same problem is occurring...does anybody have any ideas?