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The blue wire from the stereo is a remote power operation trigger of sorts. It doesn't deliver power to "drive" the remote device. It's just a way to tell the remote device to power on just as a low current circuit would engage a relay to power up a device. This blue wire should be connected to the single black wire that leads to the booster that is connected to the windshield mounted antenna. That little black box is mounted just inside the firewall behind the glove box where the lead passes out to the connection on the windshield itself. When I put an aftermarket stereo in mine many moons ago, I had to connect it to get any decent reception.
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