The front supply will be no good, it is for some reason always live. I had to have my gps speed camera detector powered from the fuse box in the boot and have a cable run the length of the car.
It works perfectly, power comes on only with ignition.
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Current: AW F20 M135i :-)
Past Masters: E90 335i with Evolve / Honda Accord Type R / Prelude VTI / Prelude 2.2 Vtec
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