So I had the soldering iron out today doing a little mod to my headunit in the E30. I like the current headunit as it is in keeping with the dash somewhat and not too flashy.
It has an option for aux but it it wasn't wired up. I soldered in some speaker cable back to a 3.5mm jack. I had a spare bluetooth receiver used for home hifi that supports a2dp that was made redundant when I bought some chrome cast audios. So instead of plugging my phone into the 3.5mm jack, the bluetooth player is hooked into it.
So now I have Spotify in my e30 and it cost my a bit of solder! It's all hidden away too and connects up automatically. Happy days....
One problem though. I couldn't find a switched line to tap into for the bluetooth. The cig lighter is always on, so I may have to wire in a little switch. I know the power for the radio is switched but I'd be worried about pulling to much juice through it, or would that be fine? I have one of those dual usb ports hooked up to it and it can pull a fair bit of current. The same one has blown a few fuses in her f10 so far so I am wary of it