So I did some more investigation and traced the harness back to the plug on the main distribution outlet, it had the part no. 211-440-32-06 on it.

Can anyone confirm this is the correct part? I made a note of all the wires on the plug end and their colors and matched them to the plugs at the end of the harness for the various points.

It all matches up. I did discover that the plug I thought was unknown was actually the emergency release for the inside of the trunk (doah).

So I'm still scratching my head, its like the second light socket and wire has VANISHED and there is no trace of it???

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Current Rides:

2004 BMW R1150GS Adventure
2005 MB W211 E320 Cdi