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I have a 2010 Fat Bob. My check engine light and battery light both come on shortly after starting. I checked the diagnostic codes and it showed both P0562 and P0563, which is charging too little and too much. Any ideas as to why its doing both. New battery and rectifier.
 

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You'll have to check the voltage output on the stator and regulator. The procedure and voltages will be the Harley Service Manual.
 
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