I found the answer myself. I post it here, maybe it can help somebody else:
the guy on thumper talks says:
Use a volt meter at the battery. This test needs to be done with a good and fully charged battery. Motor off key off - you should have 12.8 or more volts. Key on, lights on, motor off - around 12 volts is good. Motor running at idle - above 13 volts is good. High idle to around 3000 rpm - 14 to 14.5 volts is what you want to see. Suzuki says 13.5 is OK but that will not keep a battery charged. Many DRZ's will show the highest voltage at idle and the voltage drops as the rpm goes up. That is ok if it is above 14 volts. It is not really dropping but your test meter thinks so.
source:
Charging system diagnoses Plus the "Free Power MOD" - ThumperTalk
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