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Disturbed, very...
2003 SV1000S
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If you have a multimeter, measure whatever voltage is reading at the battery now, then, charge the battery fully and check the "float" voltage after being off charge for an 30mins.
Then again in half hour.....if it is dropping badly....like half a volt or more, the battery is quite probably sick, or, you are losig charge through a short to ground. Charge it again, but this
time take the positive lead off the battery and repeat the above.
If that seems ok, then start the bike and take a reading of the battery voltage, and bring the rev above 2500 - 3000 and see what it says.....should be a bare minimum of 13.5, but ideally
around 14.2...... If it isnt reaching 13 then it stator/rotor or regulator.....

More instructions will come after you have gone through those things.....good luck
 
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