The issue is usually the regulator either being bad or not having a good ground. I hate the Motorola system they use on those tractors.
Also 13.6 at 1500 RPM is about normal. You would need to get the RPMS up for full charge.
Also check all the battery cable connections. If it still has the old style that is with one cable running to the battery and then the connecting cable just under the clamp bolt, that setup never works worth a darn. Run two separate cables to the starter and then two grounds to the motor block or starter mounting bolt.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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