The charging system is comprised of a alternator, voltage regulator and a bridge rectifier. If the battery is not calling for power, the voltage regulator will not turn on the alternator. If the battery is calling for power and the alternaotr is on and the rectifier is not working, the power goes to ground.
Check the voltage at the battery with the machine running. You should have 12 or more volts - preferably around 14. Find the rectifier - it will be a cube with cooling fins on it. With a self powered test light, test it. A rectifier is made up of diodes ... the diodes clip off one-half of the AC cycle making rectified AC which charges the battery. Your test light should light in one direction and not the other. If it lights in both directions or neither direction ... your rectifier is suspect.
This is a lot ... when you get this stuff checked ... we will check the next stuff.
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