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best place to get some switched 12v in the car?

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To activate a relais, I need to have some small switched 12v somewhere (cayenne 2003 TT). I was thinking of using the rear sigaret lighter. Does anybody know whether this one is switched? Does anybody perhaps know which wires to take?

Any other suggestions are welcome as well.

Thanks a lot for the help.


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Thanks for the reply. Tried today for 3 hours without result (bose in the back, phone connection, sigaret lighter etc).

Is it 42 OR 24 or can both be used??

Can I just put in the wires together with the fuse or do I have to check something else?

Thanks, frank

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I start to feel a bit like a ......

Tried again today, but I still have not find 12V which is only on when the ignition is on.

The fuse (24 and 42) are hot full time (ignition on or off), when I measured them today.

So again.... does anybody know where I can find 12V which is only hot with the ignition on? Perhaps a wire under the driver seat?

Or am I doing something wrong??



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