NHTSA Complaint #11569904 — 2018 FORD EDGE

I recently bought my car and the battery light was on when I test drove it. They told me to bring it back and they would fix it. That it was a sensor problem easy to fix. I have brought the car back multiple times. They put a whole new sensor system in, new battery, and just recently rebuilt the alternator. As I was driving the car home, the light went on again it comes on a few times in the day, and eventually goes off by itself. None of the mechanics know what to do now. I looked up on Google if there were any recalls on my car and read something about” the power supply cables at the starter, and the alternator may not have been properly secured, possibly resulting in an electrical arc. “ I’m thinking, possibly could this be it? The light that comes on says charging system service now in red and there is a picture of at battery. I do not feel safe, especially not knowing what the problem is.