Sounds like the reverse current relay is not opening the points so I would say the spring tension is not strong enough to open them.
The reverse current relay is the one with the thick copper wire wound around the pole.
As you run the engine the generator charges the battery and builds it up. Once it's built up and you idle the engine down the generator puts out less. When the light comes on this means the current is flowing in the opposite direction. When the current starts to flow the opposite direction the reverse current relay should open thus creating an open circuit so the current stops and prevents discharge of the battery.
This reversing of the current happens fast, fast enough that your spring tension isn't strong enough to sense the low magnetic field in the pole to pull the points open. So increasing the spring tension should prevent this.
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Today's Featured Article - Identifying Tractor Smells - by Curtis Von Fange. We are continuing our series on learning to talk the language of our tractor. Since we can’t actually talk to our tractors, though some of the older sect of farmers might disagree, we use our five physical senses to observe and construe what our iron age friends are trying to tell us. We have already talked about some of the colors the unit might leave as clues to its well-being. Now we are going to use our noses to diagnose particular smells. ELECTRICAL SMELLS
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