My 99 came with a tow package but it only has the 4 pin connector. I am installing a brake control and got the wire harness for a 99 with it. My question is when I went to plug in the new harness I found something plugged into the port already. There is no brake controller in the truck now nor a 7 pin connector. Am I looking at the right one? What I am seeing is just to the right of the steering wheel under the dash. The wire that is plugged in there is definitely factory and runs into a huge bundle of wires. Any help is appreciated.