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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?

Image: enter image description here

s g
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1 Answers1

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I don't remember seeing that harness on my 2001 E46, but all the E90s have them. The general consensus is that it's used in shipping to ensure the battery remains charged. It is perfectly normal to have that harness sitting there unplugged.

Lathejockey81
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