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2021 kia k5 gt-line
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Discussion Starter #1
Will be trying to mirrortap my radar detector soon. Has any one done this or know which cable is ignition power and ground. I have the auto dimming and homelink rear view mirror. Will attach picture.
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OK, so it appears you have 3 wires to deal with. One is likely a fused and switched +12v ignition wire and another is ground. The third one is a bit of a mystery. It might be continuous +12v for Homelink so you can open/close the garage door without running the car. Note that even if you don't have Homelink, they may provide power for it in the wiring harness because the harness is used for multiple trims.

My suggestion is to use a digital voltmeter (DVM) put on the DC auto-ranging setting or the lowest DC range above 14v that will properly indicate the +12v (which will actually read a tad over 13v in practice). I'd clip the black lead of the DVM to the car frame or any metal screw head that taps into the body sheet metal (e.g. on the firewall). Avoid clipping to painted surfaces and avoid screws that have anything to do with the various airbags!

Now, with the ignition off, take the red lead and probe the three wired pin sockets on the hanging connector in the picture. If you find one that has +12v, then that is continuous power and you can eliminate it for your purposes of powering the radar detector. The other two pin sockets should have negligible voltage.

Now switch the car ignition on (it's not necessary to actually run the engine but at least have it in the ignition 'ON' setting). You should expect to find one of the two remaining pin sockets on the connector to have +12v. That will be the +12v ignition wire you will use for the positive (+) power wire to your radar detector power plug. The remaining connector pin socket should have little or no voltage reading as it will be the ground wire (-) for the negative side of your radar detector power plug.

Now you know what wires on that hanging connector to tap into for powering your radar detector. I recommend carefully skinning the insulation for these wires without cutting them. Do NOT skin them both at the same distance from the connector. That way the exposed conductors can't touch and short when they're taped. You solder the radar detector power cord's pigtails to the appropriate exposed conductors and tape the spliced areas with electrical tape.
 

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2021 kia k5 gt-line
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Discussion Starter #3
I will borrow a DVM from work tomorrow and run these tests. I really appreciate your help. Thank you !!!
 

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Don't splice the wires. Get a mirror power tap adapter for your radar. This is my cadenza also with a mirror mount. You follow the steps above to ensure which wires to tap but the adapter has needle like ends that you push into the back of the mirror plug. Power adapter and mount were available on Amazon.
 

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2021 kia k5 gt-line
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Discussion Starter #5
Yeah I have a mirror tap that I pulled from my camry that I was going to use. So no splicing. Just didn't know the pin layout. Thank you both for your help. I'll be tackeling this today.
 
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