I noticed a disconnected wire dangling next to the battery in the trunk of my 2005 BMW 330ci. It was actually a red and blue wire that veered off from the thick red one in the middle of the image. There was a black attachment at the end with 3 prongs inside, you can see the end of it hanging right next to the battery.
I pulled back the carpet wall material to see if it might have gotten pulled out of something and I noticed another wire that was detached. That was a set of 6 black and red wires that fed into an single row, 6-prong connector. You can see it curved upwards and in front of the thick red wire.
What are these used for?