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Riding a 2009 R1200gs
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751 Posts
Start by measuring the battery voltage during cranking, 3 components are suspect:
  • The battery
  • The cables
  • The starter

If the battery voltage does not drop below 10v during cranking, measure it again right at the starter terminal (or measure the voltage drop between the positive terminal and the starter terminal while cranking).

If the voltage drop in the cable is less than 1v.... the starter might need replacement.
 
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