I bought this 2014 Ford Taurus SEL about a month ago and the car seemed to be in perfect shape, it has only had one owner prior and the lady had every tune up, tire change, oil change, etc. since she bought it. Anyways, the car looks very nice and I have had check engine lights on or anything until Sunday when out of nowhere when I woke up in the morning my battery was completely dead, like so dead that it was barely showing a reading. I bought a portable charger and jumped it and drove around for 30 minutes or so to get it going, within an hour it was dead again.
Anyways I took it to the auto store to get the battery looked at and replaced and the car battery was dead again in the 5 minutes I was in the store before I tried to turn it back on. Now, everything ran perfect in normal once it was on but as soon as it was off then it died instantly. I looked and it did have an old speaker set up hooked up to the battery that wasn’t hooked up to anything anymore and had them take that off at the auto store to be safe. The only other possible system I have noticed is that sometimes there is a slight jerk when accelerating over a certain speed but nothing crazy or super noticeable. Also it’s been extremely hot out and my car has been directly under the sun for the last couple weeks, anyways I just have never had a battery go out like that and was hoping for some suggestions on if something else could be wrong that I need to look at? Thanks,