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Old 05-19-2009, 12:46 PM   #3
ca1242
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Join Date: Aug 2003
Location: Burke, VA
Posts: 7,634
My Ride: 2003 330i
There is no relay. Radio supplies 12v signal directly to the amp + antenna amplifier.

Are you sure you tapped into the correct wire? On some cars, there are more than 1 white wires.
Disconnect load (aftermarket amp) and test wire again. if it works fine, the amp might be overloading the radio's output, you need to add a relay.
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