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Understanding stator resistance reading Understanding stator resistance reading
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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 29 Sep 2017
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Understanding stator resistance reading
Hi again. I'd appreciate some help in understanding the readings I'm getting from my stator so I avoid making an expensive mistake. I've got some flaky charging issues that only show up after I've been riding for three hours or so. The VR is new so I'm trying to figure out if the stator is faulty. The manual says the reading across the contacts should be between 0.52 and 0.78 ohms. Mine is reading at 1.3 but it is at the highest setting of sensitivity (200 ohms). Is this enough to confirm sick stator? Thank you.
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Old 29 Sep 2017
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Hi, make sure you subtract the resistance of the meter leads. Touch the leads together and deduct amount from the reading. Also make sure you have a very good contact with the connector as those resistance values are quite small and are easily swamped out by poor connections.
You can also check the voltage being produced from the stator coils when engine is running (which will be an AC voltage) to get an idea of how the charging circuit is performing.
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Old 29 Sep 2017
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As dblunn says, take a 'zero reading' of your meter with leads and take that away from your stator reading.

There are two further things.

You should also take a resistance reading from one of your stator connectors to 'earth' (battery negative terminal or any clean bit of metal). This should be 'hi resistance' say, over 2,000 ohms.

You say that it only acts up when the engine is warm.
This is when you want to take your resistance readings.
You should also check that the battery is not boiled dry (how hot is it when the problem occurs?)
And the rectifier/regulator .. how hot is that when the problem occurs?
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Old 29 Sep 2017
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Thanks guys for the very helpful advice. I'm fairly new to this so hadn't thought to check the zero resistance but it explains the discrepancy - touching the leads gave me 0.6 ohms which makes up the difference. So I guess the stator is ok but I'm running out of ideas on where to look for the source of the problem. What's happening is that after a few hours riding (with lights on) the battery voltage suddenly starts dropping. I turn the lights off and it climbs again. I've tried everything I can think of - changed the rectifier/regulator and finally rewired the whole bike to eliminate any possibility of shorts or earth leakage. But it's still there grrrrrr
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Old 29 Sep 2017
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Fault finding chart
Try this chart to compare your specific symptoms for their fault finding flow chart - without following the logic of such charts, electricary is tricky stuff!!
http://www.electrosport.com/media/pd...ng-diagram.pdf
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Old 4 Oct 2017
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Thanks for that link. It was very helpful. I've gone through the whole flow chart and everything seems to check out ok. But I'm still getting this voltage drop when riding with the lights on. With my old rectifier it would drop from the charging voltage of 14.6 to around 12.6 as soon as I turned the lights on while riding. With the new one the voltage stays steady at 14.6 until half an hour or so into the ride and then drops by around 1.5 v.

Is it normal for the voltage to drop like this? I've spent many hours searching for an answer but have not found it yet.
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