Here is something I found that may help you. It looks like YT will not let me post a link to it. Search JD 301B wiring diagram it should show up as a post on another forum. There is a wiring diagram for a 300B, so if it is anywhere close to the wiring on your tractor it shows a Green, Black, Orange and 2 purple wires. And it looks like the wires are in a plug which is common for later voltage regulators. The second post with the diagrams worked better for me on my phone. When I clicked it a tool bar popped up and a square with an arrow up out of the corner showed. When I clicked it the diagram opened as a picture I could view easier. If this does not work for you you will probably have to find a service manual to purchase for your tractor which will have a diagram included. Or maybe someone will come in with other information.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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