Here's one of my older post regarding this issue, and the fix most people have done to bypass the shaky grounding and connection that BMW designed for this tail light carrier/connector. Whichever grounding method the user use, make sure that the connector is still removable without the need for tools as it should be, and provide a vibration proof connection.

http://www.bimmerfest.com/forums/sho...6&postcount=22

What I did is back out the brown terminal from the carrier, and cap it together with two other brown wire, install a male and female spade connector, shrink wrap the exposed ends, and reconnect. Same principle as the second link, just simpler.

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Nube1Kenobi
2008 535i Monaco Blue/Dakota Black/Dark Poplar | Sports Package | Premium Package | Cold WX Package | Navigation, Voice | RTTI | PDC | L7 | HD | I-Pod/USB | PWR rear shade | Sports Auto - paddles | Active Steering | Comfort Access | Fold Down R/seats | Rear DMS Airbags | Adaptive Xenons | Now with recalled and replaced -446 HPFP

Do not argue with an idiot else he lowers you to his level and beat you down with experience..