I'm going to tap into the head units' turn on power and run a single usb to power a firefly bluetooth adapter. Don't want to use the cigarette adapter because its always on and also don't want to rely on the adapters sleep function. Cant really find what wires do what online. Anyone have pic or two or a site thats got some answers. Appreciate it.

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1997 E39 540i (Sold)
2005 E53 3.0 125K miles