[IDBMW]

Here is a little device that makes for a clean install for additional fused 12V power from the fuse panel like a radar detector.
You remove the original fuse and Install the Add-A-Circuit. One of the fuses in the Add-A-Circuit replaces the original fuse and the other one has the wire connected to it for accessories use.
I use this for my radar detector. On my Z4 the fuse panel is behind the glove box. I run my radar detector power wire from the fuse panel up the A pillar, across the top of the windshield at the headliner. The wire is hidden out of the way.
You can tap power from the overhead lights to make a shorter run to the radar detector but it is not fused from the accessorie and could cause problems if you get a short