Just replace alternator and battery 4 weeks ago then drove 2,500 across country. Went to my car this morning and car had no electric power and would not start. I jumped the car and it started drove around 20 minutes and parked it shut it off and then started it right back up again. 5 hours later I went back to the car and it had no electric power again and would not start. There are no lights on the dash and I also made sure all lights were off and locked the car 5 hours earlier. If anyone can help me I would appreciate it.
Thank you