Red, I like the way Ray Tractor approaches it, one system at a time!
Don't let this overwhelm you! You won't believe this, but the hardest part of installing a wiring harness, is installing it! Getting the thing strung through all the places it needs to go so it doesn't get cut, burned or pinched, and all the wires reach where they are supposed to go! If you have done that part, the rest is easy!
Remember, any adapted, fit all, even factory harnesses have extra wires that will not be used in your application. Look at any car or truck, you will see dead end wires hanging everywhere!
Start with the obvious. One circuit at a time. I like to make temporary connection first, don't cut anything until you are sure. Once you get it to the point you can make your battery connection, start with everything turned off. Temporally sit the battery cables on. There should be no spark. Remove the battery cable. Then, for example, turn on the light switch. Sit the cable back on. It should make a small spark and the lights come on. If it pops, remove it immediately, something is wrong. If the lights come on, that circuit is right, move on to the next one.
Once you get everything working, go back and tidy everything up. You want this to be a neat, profesional looking job when you are done. Use lots of small black zip ties, shrink tube and solder whenever you make a connection. The split black harness tubing makes for a clean look, and helps protect the wire from thee elements. Avoid tape! It will look good for a short time, then it will start coming unraveled!
Remember to use what you have been provided. A good wiring harness will not repeat colors. You can be reasonably confident that a particular color wire is the same circuit wherever you see that color in the harness. Some harnesses are not color coded, they will be numbered. Same applies, that number wire will be interconnected throughout the harness. Also you can search for wiring examples. Look under "Images". It doesn't have to apply to your specific tractor. Example, "Delco Alternator Wiring" will show dozens of examples, look them over until you find one that you can understand and apply.
Get yourself at least a test light, preferably a test light and a cheap multi meter. They are simple instruments, a real easy way to tell if a circuit is live when it's supposed to be, or a connection is made with what you think it should be. The more you use them, the more comfortable you will get until you wonder how you ever did without them!
Do what you can, then if you get stuck, ask again, be specific. We'll talk you through it!
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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