I rewired my '55 1st series in 2001. I'm not good at 'tricity and everytime I learn something about it, it rolls off my mind like teflon in a day or two.
I didn't like or understand the single page of instructions that came with my harness so I set about with a volt meter to find out where each wire in my harness went and to draw up my own wiring diagram.
When it came time to do the deed, it took two days of the four allotted and no fire extinguishers were harmed during the startup process.
My Shop log entry on the rewiring is here and along the left side of the webpage are links to my wiring diagram and individual circuit diagrams in pdf file format.
http://www.laroke.com/larryk4674/2001/wip13a.htm 
