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It isn't that hard on something as simple as an old car, truck or tractor. I haven't had the best luck with crimp on terminals, so I usually solder the connections, especially on wires that will be carrying lots of amps or those that might vibrate loose. I also really like heat shrink tubing for insulation over a soldered connection. One mistake I would mention. Don't use sticky electrical tape to cover a group of wires. I have had bad luck with it coming off and leaving the wiring underneath a sticky mess. Making a wiring harness may be your only option, depending on what you are working on. If you are doing a "correct restoration" the right factory colors of the wiring insulation are needed. If you are just getting the machine to work, color is less important. I would suggest using several different colors for different circuits, as it is much easier to track down problems later. Plan your wiring harness with wire at least as heavy as the factory used. If you are changing from a generator to an alternator, the parts store should have the correct plastic wiring plug with short wires that plugs into the alternator. A real pain to do without that part... Good luck--it isn't that hard to do, or all that expensive on an old machine.
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