I searched around and couldn't find anything that relates to what I'm looking for. I have a Bluetooth fm transmitter that I mounted on my dash. It was originally a cigarette plug but I didn't like always having to plug it in and unplug it since the cigarette plug has constant power. I want to hard wire it into an accessory that turns on with the key, mainly the radio but I'm open to suggestions. I have an unused wire/plug for a cigarette lighter under my center console but as far as I know that has constant power as well. What would be the recommended way to tap into something for power that is close to the radio, but doesn't involve taking the whole dash apart? Any suggestions on what to tap into? I have a 3rd gen, 2002 Mercury Mountaineer with the 6 disc audiophile sound system. Thanks for any help.