Hi there,
Thank you for the donation,
You may have a failing alternator, if the alternator is not charging at full capacity, you will not be fully charging the battery and demand on the electrical system driving at night or with extra load such as A/C may have the system balanced on a knife edge as far a re charging is concerned, I would get the battery fully charged & load tested and have the alternator tested under peak load conditions as well, this may well show up a fault in one or both components, start here.
Mark (mhpautos)
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Monday, September 20th, 2010 AT 5:16 AM