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Alright, I'm trying to install an F90BT in my 2005 C230. I have the Scosche VW03B adapter and have tried swapping the red and yellow and tried leaving them the same.

The only way I can get the unit to turn on is if I wire both the red and yellow leads together, then it will turn on, but remains on even when the car is turned off.

Anyone have a solution to this problem? What am I doing wrong?
 

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2004 C230 Kompressor Sport Coupe
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If you can't find a switched line anywhere else, there's one available at the lighter socket. Depending on the draw you get on the switched line that might work fine. You won't get the key-off-radio-on stock behavior but it will switch with the ignition.
 
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