When I purchased my 2015 Transit Connect Wagon, the dealer said it would be no problem to add a couple extra circuits for accessories at one of the fuse boxes. After working my way through several sales and service staff members, the “wiring specialist” finally determined that what I wanted was not possible since the spare fuse slots have no connections on the load side (see F43 at top left in photo below) and Ford won’t supply the parts to add them. So in the end I had to come up with my own solution. And knowing wiring but not cars, my first purchase was the wiring diagram book. I may not know how everything shown in it works, but I can make sure I only tie into something I can see documented and feel confident I understand. Initially I tried the basic auto store inline fuse holders with converted fuse legs as power taps. Although the connections were pretty good quality, strong silver solder and multiple layers of heat shrink, I didn’t like the holders just hanging loose and there were too many potential failure points. So after some searching I found some parts that make for a nice clean, almost bulletproof, wiring harness for accessories.
I’ll apologize in advance for the length of this post up and I'll try to break it up into readable sections with a few photos each. I know I have a tendency to overdo the story telling, but I wanted to share what I learned along the way and why I chose to do it that way in the hopes it helps others with similar projects.