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 - Trailering Your Tractor - by Curtis Von Fange. One of the fun things of summer and fall are the parades and tractor shows that go on across America. Many owners of tractors travel long distances to attend these shows and they usually take their restored iron along with them. Safe trailering practices and inspections will ensure that the event is a fun one. A good habit to develop when using a trailer is to give that �quick look over� before taking it on a trip. Before hooking up to it check the tongue for proper operation. The latche
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