The voltmeter on my Rotax 912 UL has developed a fault. At the cruise (5000 RPM), the needle bounces rapidly between 12 and 14.5 volts. At lower RPM (2000) it sits on 13.8 with only a tiny flicker of the needle. The battery holds its charge perfectly and starting is not an issue. I have replaced the Ducati voltage regulator as a precaution, but it has not made any difference. 

Does anyone have any idea on what could be causing this problem?



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