I agree with what mud pie and rocketeer have said about a new "purchased" wiring harness. As many of you know, I restored my own 1949 CJ-3A, and simultaneously restored a friend's 1944 Willys MB (multiple pics of both are posted on the old forum). I thought I would save some money and make my own wiring harness because it looked to be such a simple harness. I thought I could surely do it in just an afternoon. I crimped and then soldered each connection. It turned out well, but instead of an afternoon, it took me nearly 3 days to complete. Not wanting to go through that again I purchased the harness for the MB.
One thing to be aware of, the purchased harness is manufactured to be installed into an original application. It will need to be altered to fit any altered circuitry that may exist in your particular Jeep, i.e., fuse box, alternator, fuses, different lighting, etc.