Cigarette lighter Live or Not on SLK 320

[Texkeen]

I just bought the C-tek intellegent battery charger to keep my SLk 320 2002 battery in good condition as I don't use the car that often.
I phoned Mercedes Cardiff to find out if the cigarette lighter is live when ignition is off the answer being yes so this enabled me to buy at extra cost a adaptor to charge from the lighter.
Having tried this method I find this lighter has no power when the ignition is off and have wasted my money.
Does any one know if my car is at fault or Mercedes gave me an incorrect
information.

Tex

 

[pammy]

Wrong advice I'm afraid. The socket is not live when the ignition is off - not unless it's something that can be set differently car by car or my SLK320 has the same fault as yours