First make sure you have a good ground. Remove the negative cable where it grounds to the frame and use sandpaper to make sure it is clean. The most likely guess is a bad voltage regulator (if equipped with one) or the charging coil that is under the flywheel. Use a multimeter set on DC voltage to check the output to the battery when the engine is running. You should see a reading of around 13-13.5 volts. If less then this it is most likely one of those two items.
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