[metalboy4]

The pigtail should have come in the glovebox or wired under the driver side dash. You will have to wire the pigtail to the controller based on the installation instructions of the controller. The owner's manual says it is pre-wired under the dash but mine came loose and I had to plug it in. Also, for 12 volt power you need to plug in a fuse in the fuse block under the hood on the drivers side. I did my 2005 TB myself and it works fine. I wired my controller and pigtail using a 4 pin trailer plug. I wired my truck the same so my controller can be moved quickly between truck and trailblazer.