I own a E46 sedan (2004) fitted with N46 engine.
The battery is located in the front of the car.
I should want to know if it is possible to find a +12 volts wire in the boot, at the rear of the car.
Probably not in the amperage that you would want. If you run your own primary wire, make sure to do so on the passenger side to reduce electromagnetic interference. That is how BMW does it in the US models.
If you are just looking for an accessory 12v wire, you can find some one the stock amp, the antenna amplifier, etc.
if you only need 7amps then the cig lighters should work for you. That should have a 10amp (?) fuse. EMI only really comes into play with higher current such as an aftermarket amplifier or heavy electronics. I little circuit should not cause any problems.
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