Was wondering if you ever figured out the wire tap to the mirror. Just bought a 2020 after trading my 2016. No place to plug the wire tap. Really don't want to hard wire to fuse box under the hood but will if I have to.
I just redid my radar detector hardwiring yesterday because I didn't like that I couldn't put the cover back on, over the fuses, with an Add-A-Circuit in place. (I'll re-deploy that wiring in another car I have.)I've been waiting since November for someone to post some instructions. I havent removed anything. Have the mount up and ready.
Anyway, I tapped into the mirror's power. It was very simple. I have a 2020 SR5 Premium. There are two plastic covers concealing electronics on the windshield behind the mirror. The thin cover directly above the mirror's mount slides up (parallel to the glass) and comes off to reveal a connector with only two wires (one white-with-black-stripe, the other blue). I used the black tap lead to tap into the white-with-black-stripe wire. I used the red tap lead to tap into the blue wire. I verified that I had 12V of power and that it turned on/off with the ignition.
The mirror tap I used had two sets of leads with different size pins. I used the small pins and capped off the other pair with the included caps and then wrapped them up with electrical tape to keep them out of the way. This is the Mirror Plug Wire Tap that I used:
Amazon.com: Radar Detector 12" Mirror Plug Wire Tap RJ11 Hardwire Power Cord Kit for Escort Valentine One Uniden Beltronics | Tap Existing Mirror Plug | Inline Fuse with Braided (Dual Size Pins) : Electronics
I also used this mount for my radar detector:
Amazon.com: Radar Mount Mirror Mount Radar Detector Bracket for Escort IX EX Max360C (3001007) : Radar Mount: Electronics
There are a few comments about people stripping the screws on this mount. There's a workaround, if you do strip them, but I found that the mount holds well without having to over-tighten. Easy does it.