Don't have a diagram or pictures, but considering the age of the tractor, the wiring will be basic and straight forward, no mystery electronics!
If you will do some investigation, chances are you can identify what the wire does and where it came from. Don't look at the entire harness, it may be overwhelming. Instead look at each circuit. Make a list of what works, and a list of what doesn't. The stuff that works, look it over for needed attention.
What doesn't work, look for clues. Look at the color of the wire, look at where it would logically lay when connected, where it will reach to, etc. Say you have a headlight that doesn't work. Out at the base of the light is a yellow wire. Looking under the dash, there is a yellow wire hanging near the light switch. Good chance it came from the light switch. Start with the easy and obvious, by process of elimination it will all eventually come together.
A test light is a very handy tool to have. Takes a lot of guess work out of it, will diagnose 90% of what you will need for that tractor!
Don't be afraid to try, but do be careful. Be sure to keep the transmission in neutral while working on the wiring, keep clear of moving parts, just in case. Use your computer! Google images and Youtube have a wealth of information. It doesn't have to be specific to your tractor, the early circuits are widely generic to many models.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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