i did this exact same hardwire but with a valentine1, used fuse #8 (lighter) on my E92. worked like a charm.. getting the a pillar trim back on was kinda frustrating but it worked.
i found that the best place to mount the detector is just to the left of the rear view mirror. works great!
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2007 328i Crimson Red *SOLD*
2010 335i MSport AW E92
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