Unless your 2016 TC has leather seats, you likely do not have heated seats. I know that heated seats are not really necessary, but they are wonderful! I combined this project with a future stereo amp and subwoofer upgrade.  I was adding 7 circuits to the rear aux junction box (AJB). I would connect directly to the back of the AJB for each circuit using the connectors Don Shockley and I sourced. http://fordtransitconnectforum.com/topic/5618-add-circuits-directly-to-aux-junction-box-usi