12V (Cig Lighter) only powered with engine running?

I suppose it depends what you want to use the powered socket for....
I have my dash cam plugged into it, so I want it to switch off when the engine is off and come on when I start up.

Then again, I do have 2 lighter sockets, haven't tried the other.
Would be sensible if one was permanently on and the other came on with the engine.
 
Then they are both linked powered with the engine as I use the one at the back.
I know it's a long way; but otherwise I have wires all over the place.

It might have been sensible to have one powered and one not.

.
 
I fitted a socket in the boot straight off the battery for tyre inflation, etc.
I suppose with so much electrickery, BMW didn't want someone draining the battery by having a phone or power invertor connected, without engine running.
 
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