Soon after I got an engine replacement in my 2009 Aveo, the battery and brake lights would come on and the battery would read below 12 volts and not be charging. We've had a similar issue on another car so we replaced the alternator. Worked great for about a week, then same issue. Took it to a shop and told them it was a brand new alternator. They tested the alternator and said it wasn't putting out. Got a new alternator put in. A week or so later, same issue. Took it to a shop I know better and told them this would be the third alternator to go out. They replaced the alternator. Two days later, same issue.
Now, we can fix it for about a week by disconnecting the battery for several minutes. I believe it's a computer issue, but no one will do anything but replace the alternator and four alternators later I am certain it's not the issue.
Can someone please help? I've already invested over 6k into this car.