elejes 
Newbie here! I registered because I recently bought an 07 Grand Prix (V6 non-charged) and I know this forum can be a benefit. I don't know if I should post this question here, but I have a major issue. Two days ago I swapped the battery on my car becasue it was giving me issues starting in the mornings. Since it was late Sunday and my nearest Auto Zone was closed I decided to swap the battery from another car that is just sitting in my garage. I noticed the battery was larger and had more crancking than the original so I kinda rigged it by finding a new ground for it. Car started up and drove around with no problems. Well today the car suddenly died on me at a light without any warning. No power whatsoever. I messed with the battery cables which were a bit lose and coroded and heard power come on. The car started like nothing for a few seconds and died again without any power. Someone offered jumpercables but nothing. My question is, can this be my alternator issue? Doesn't the problem start with interior lights or headlights fading first? It's got to be electrical in my mind. I'm about to clean and retighten the posts. I will also check to see if the new ground is adequate or if any lose cables got crimped. If anyone has had this happen before please help. Sorry for the long post.
Thanks in advance!!
