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Just hard-wired a radar detector. Used an Add-a-Fuse connector into Fuse #23 (radio) on the passenger foot well fuse box. Ground is to the stud/nut on top left side of fuse box.

All works fine, EXCEPT the radar detector is now non-switched. Always On.

It is on the same circuit as the radio, and radio works same as it always did.
(On with switch and off with switch off and door opened.)

This is what I want for the radar detector.


How can it be different for two devices on same circuit?
 

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Just hard-wired a radar detector. Used an Add-a-Fuse connector into Fuse #23 (radio) on the passenger foot well fuse box. Ground is to the stud/nut on top left side of fuse box.

All works fine, EXCEPT the radar detector is now non-switched. Always On.

It is on the same circuit as the radio, and radio works same as it always did.
(On with switch and off with switch off and door opened.)

This is what I want for the radar detector.


How can it be different for two devices on same circuit?
Because the radio circuit *IS* 'always on'. Its a signal from the BCM that turns it off.

You need to use a different circuit for your add-a-fuse. I'm out of town, so can't give exact locations, but IIRC the fuses just to the right of center in the BCM should be ACC switched. Test and see.
 

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I hard wired my radar detector a month ago. I tapped fuse 27 in the passenger footwell. It too, is not switched. It is always on. However, I do think that if I accidentally left my radar detector plugged in, power to fuse 27 will time out because it is for the interior lighting and interior lighting cuts off after a while to prevent a dead battery.
 

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2009 Mysterious GXP Coupe #100
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No, the interior lighting is always hot with a variable ground.
 

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I tapped into fuse 21 on my 2007. It's a spare 12v switched circuit.
 
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