I just went to the Ron Francis site and seen they have a new style harness the "24/7".
http://www.ronfrancis.com/prodinfo.asp?number=AC-67
Its a lot more compact than the Express series and pretty much can be had for any options you can throw at it. They will include hookup for any alternator or ignition system you have, and they provide large gauge wire for the alternator.
My good Bronco has a Ron Francis Harness purchased from Randy at Adventurous 4x4, not the EZ Box, looks to be a little bit bigger, it has a spot for everything you can throw at it, Its not a drop in like the Centech Just takes a bit more planning and work, but is way more flexible.
I'm still trying to decide on what harness to install into the trail bronco and the Ron Francis is at the top of the list, not sure I need something this nice in a trail bronco but its very flexible and I'm picky on my wiring stuff.