Before installing in the dash I checked by pulling the radio out of the dash and wiring it in series from the antenna to the radio. 12V connected with jumper. Tune into an FM station with poor reception that I wanted to improve. The amp was on, the red LED was lit when I pushed the button. Whether the 44-UA60 LED is on or off makes absolutely no difference to radio reception. Bought this a few months ago and can't return it. I recommend you do this simple test before you slice your dashboard to install this useless junk!
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