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You have a fuse box inside below the glove box. You can tap into the fuse that would power the right hand power point in your dash, the one that's only on with the ignition on. I wouldn't use the scotch lock type connector. I'd use one of the other taps, or one of the "add-a-ciruit" taps you can get at Autozone to avoid actually damaging the wire. Get your power from there, put the ground in a suitable location under the dash, run the mute button over to your driver's side under the dash, and then the modular plug up inside one of the A-Pillars up to in front of your headliner and to your detector. That's if you want it mounted up by your mirror. Otherwise, run the modular one to your preferred location.
 

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You have a fuse box inside below the glove box. You can tap into the fuse that would power the right hand power point in your dash, the one that's only on with the ignition on. I wouldn't use the scotch lock type connector. I'd use one of the other taps, or one of the "add-a-ciruit" taps you can get at Autozone to avoid actually damaging the wire. Get your power from there, put the ground in a suitable location under the dash, run the mute button over to your driver's side under the dash, and then the modular plug up inside one of the A-Pillars up to in front of your headliner and to your detector. That's if you want it mounted up by your mirror. Otherwise, run the modular one to your preferred location.
I've always wondered this myself. With those fuses being the lowprofile variety, would tapping it be as easy as inserting a wire the same time as the fuse is inserted? Or, is there a device like this that should be used:



EDIT: I should have read your response more closely. Doh!
 

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I wouldn't just stick a wire in there. It looks like his kit comes with something like what you have pictured. Another option is one of these:

 
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I just checked on a Toyota/Lexus forum, and the add a fuse does work with the low profile fuses. Good to know. O'Reilly's didn't think it would work.
 

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I am thinking about doing this as well. But, I want to hang it from my rear view mirror. I need to find out which wire up by the mirror is only on when the ignition is on though.
 

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Grabbing power from inside the overhead was what I did. I didn't know the color either and don't remember now. I just used a voltmeter and probed until I found one I could use.
 
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