Aren't the cigarette lighters in older BMW's a slightly different diameter than normal car lighter sockets?
In my 2002tii I could not plug in my Whistler radar detector. I had to cut an 12V extension cord and hard wire the female socket to power the detector.
your E9 should have the same issue
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2017 GMC Sierra 1500 SLE
2020 Fusion Titanium
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