Wiring harness for model B

 I wouldn't use solid wire.  I have made my own harness with 10ga braided wire. I just drew up a picture of what I needed and used different colored wire to keep track of what went where.

Pretty darn easy if you purchase one of our wiring systems.  Step by step wiring instructions, color coded wiring, along with numbered circuitry, and color coded CAD wiring diagram. All you need is ambition to install it. That doesn't come in the kit. If interested, drop us a line. Be happy to help you out....

Any generator can charge as negative ground or positive ground. If you don't polarize it after wiring and before starting there is a good chance it doesn't know what ground you have and can discharge the battery instead of charging it. Eventually the smoke will come out of the genny or the cut out or regulator, whatever you have and you can't put the smoke back in.
Some reading: http://web.utk.edu/~tprather/FoothillsTractorClub/TechTips/PolarizeGenerator.html

If you buy the harness from Steve, it might take an hour or 2 at most to hook up and you can have it polarized and ready to work. If you don't know about polarizing and cut outs verses regulators (and there are different types of regulators) you might need help with wiring to keep the smoke in where it belongs.