Plug-and-Play Radar Detector Mirror Tap
I was looking for information on a radar detector mirror tap for my wife's 2018 GMC Terrain Denali and couldn't really find anything, so I figured I would share what worked for me. I ended up getting a plug-and-play harness from GEN5DIY. Their tech support recommended a 15-19 Yukon Radar Detector Harness since the mirror connectors in most of the newer GM vehicles are the same. I purchased and installed it today. My wife's Terrain has Lane-Keep-Assist which has a camera the under the plastic cover, making it a very tight fit getting the extra connectors under the cover, but I was able to squeeze everything in and get the cover snapped back on. This harness is very similar to the ones I previously installed in my 2016 Camaro and my 2018 GMC Canyon. You can get a 10% discount with the code "lethal10" (from the Camaro6 forum).