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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #1  
Old 4 Jul 2010
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Funky electrics on my XTZ 660

I did some measuring on my bike with engine running and found that the low beam voltage fluctuates between 9-11 volts (very rapid fluctuation, so it's not really visible to the eye when you look at the light). The battery measures a fairly steady 12.3 volts.

Where do I start to look to debug this? I have a standard fluke for measuring.
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Old 4 Jul 2010
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Multimeters can give you very misleading readings.
Unless you know what you are looking for you will be baffled by what you find, I know I'm an electrician...
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I'm a country member...
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Old 5 Jul 2010
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Hi,

normaly with running engine you should read like up to 14,3 Volt on the XTZ 660. How old is your bike the fist models had a small rectifier with 4 kables connectet to them, they like to fail. The newer ones have a bigger rectifier they normaly dont give any trouble there are 5 or 6 cables connectet to the rectifier.



regards

Thomas
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Old 5 Jul 2010
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It seems to have the newer rectifier with 5+ cables and fins. The bike is from 1994 with round headlights. The battery measures 12.3 volts, regardless if the bike is running or not.
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