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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