Hi JAD,
Not sure about the question, but my understanding is that the '12 Volt' sockets are not permanently live, but turn on when the car is unlocked and stay live for about 30 minutes after the ignition is turned off. If that is OK for you, and you may want to test it somehow, then fine. If your question already takes this into account, then you need one of the more technical posters on here to advise.
Cheers,
Geri
Edited by: Geriatricus