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Originally Posted by mtd
Tom,
there is a power connection that is on the DSP amp itself. Can we tap that for the 12v supply. Also, is that power source continuosly on?
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Depends on the X5, later models offered the feature of using the radio without the key in the ignition. Here's a picture of the wire I use:
This provides an always-on condition, I believe the purple wire is a switched 12V, you should verify with a multimeter to be sure.