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  1. zeroguarantee

    Cheap Bluetooth adapter chorus II red 12v wire.

    Hi, 2011 A3 8P non Bose. I Just bought a cheap bt adapter looks like it just plugs in the aux, but comes with a black wire and a red. Presumably I can earth the ground to the head unit chassis screw. With the 12v red cable what will be best to connect it to? Switch live or a 12v constant...
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