Q: Car won't start, then starts, then quits again

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When trying to start my car this morning, it was dead. All of the lights were working fine. I jump-started it and went on to work. 5 ½ hours later it started, with no problem. Then, around seven hours after having been parked, it was once again dead. The lights and all other things are still working well. Tomorrow, I should have the battery tested - or it might be the alternator. In your professional opinion, do you think it is the battery or alternator or something else?

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