Brake control for 99 yukon slt

Hi, I bought a 1999 Yukon slt with the tow package, now I'm trying to put in a brake control :banghead: . Did the 1999 model tow package have a brake control wiring harness available, or will I have to wire it in myself? Thanks for any help.

My 1999 SLT had a "pigtail" up and under the drivers side rear of the vehicle, I wired my 6 prong female plug and there may have been a couple or three more wires that I didn't need to use..........you may want to start your search there. Hope this helps.