GND connector for BOSE on/off signal ?

karltea

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Hi all,
I am fitting a non OEM stereo to my Audi S4 cab b6 which i believe is a full Bose system ? (It has all the LINE OUT wires and the speaker ones too and came up with BOSE on the stereo) I have pulled out a Symphony 2 and have a few questions
1)The bose amp is triggered by a signal from LINE-OUT switched 12v is the common next to this used for the trigger signal or is it the main 0V ? (i just want to get the amp turned on)
2) Mine has the normal DIN/ISO and Fakra aerial leads , anybody know where i can get an adaptor for this in the UK (seen the double Fakra and din ones but not with both) seen them in the but its 20usd postage from the USA :(
3) whats the ALARM GND for ?

Thanks for any ideas
Karl

IMG 20150124 131126
IMG 20150124 131126