This fitted my 2003 Yukon Denali right away and when I connected it to the controller it worked straight away. I would recommend it for full size GM 01 -06 vehicles. Go to YouTube and find a video about installing electric brakes on GM vehicles. You may have to look at a few, but it will show you where to connect the other end. I believe it was the 2nd block (top row) from the left in the bottom drawer at your feet. You have to remove the lid, but everything is already hot. It's truly plug and play and lights up as soon as you hit the brakes. I used this controller. Hopkins 47235 Brake Pulse Controller
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