The original, expensive type are not the way to go. Most are the same pvc wire as used in the universl kits, with cloth covering, no fuses, no expansion possibilities. Rip Off.
DIY does not save any money and collecting all the parts is a real hassle. many times you have to buy minimum orders with electrical supply companies. Depending on the era of truck. The kits have good packard 56 connectors. Semi era correct and necessary in some cases. Time to get rid of the inner fender terminal blocks also.
The way to go especially with a 12v conversion is a universal prewired fuse panel kit. Advise alternator at that time also. These harnesses are pretty easy to install. Many of us can help. I have much experience with them. Easy to install. Our old trucks are very simple. Very few wires.
Speedway has a 12 Circuit for $186. A 22 circuit for $203 (may be the best value). Amazon as low as $125. Jeggs, Summit, Classic Trucks, Painless, EZ Wire, AAW, etc. Don't buy from a funky place/guy.
These kits will need you to crimp. Good crimpers are available. Solder is not necessary with a good tool. These kit sellers all use basically the same quality automotive wire. The prices reflect number of circuits and the extras provided in kit. Just check out the literature for the one you wish to buy.
Most say do not support ammeter, some say don't support generators.
Probably repeated some of what Fibonachu said.
