My son gave me a working power antennae for my 1991 318i. has an aftermarket sony cd/radio. The connector from the radio to the trunk has a red and white lead. with the power on and set on radio there is power to the red lead in the trunk. no power to the white lead. When the antennae is out and tested on a 12v battery it goes up and down. What should I check next? thanks, mike
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