| Author | Message | ||
     Bextreme04 |
So I am having charging issues and when I tried to troubleshoot I get some really wierd readings. Each leg has 0 ohms resistance to ground which should mean a bad stator but then when I start it and check ACV I get ~20VAC at idle and ~ 50VAC around 5,000 rpm. Also when I disconnect the output from the VR I am getting 16VDC but when connected it varies between 12.6 and 12.2 VDC. Could it be a bad VR? The continuity to ground says it should be a shorted stator but then it's still producing the correct voltages... Anyone have any thoughts? | ||
| Baf |
Are you absolutely sure you're reading the meter right with the 0 resistance to ground? It might be saying OL or something like that to say it's an open circuit. | ||
| Bextreme04 |
Yeah I'm sure. I thought it might have been an erroneous reading from the cheap Multimeter I was using so I went and got my brother-in-laws' nice Mac tools multimeter and verified it was 0.0ohms resistance between all the legs and ground and about 0.2ohms between each leg... But it was still producing the correct amount of voltage between legs while running. | ||
| Terrys1980 |
Even a dead short would still be around 0.1-0.2. You probably have a short between two legs. It would highly unlikely that all three legs are shorted to ground. | ||
| Sparky |
What did you disconnect? If you disconnected the VR from the battery, that's not good and doesn't prove anything. Bottom line though: if any wire of the stator shows other than infinity (open circuit) to ground, the stator is shorting to ground and won't (likely) produce charging current. If you are getting approx 12.2 VDC while charging, that's low; it should be around mid 14s. (Message edited by Sparky on October 06, 2012) | ||
| Baf |
All three legs are hooked together, so all it takes is for one to be shorted to ground for them all to show the short. I agree with Sparky's conclusion. 12.2VDC isn't even acceptable (IMO) with a hot engine with fans running full blast at idle. | ||
| Bextreme04 |
I am aware of all that... The question was if it is shorted to ground why would it still be outputting the correct AC voltage while running? And if it is still producing AC voltage why wouldn't it be charging? Is there any way to test the VR? | ||
| Zac4mac |
The continuity to ground and the AC output don't jibe. Can't be both... As soon as you connect the VR output to the bike, you are measuring battery voltage. I have no idea what to expect for an output with the stator connected and the output lifted from the batt. Most of the VR failures talked about here started as short, high-voltage excursions(16-18 volts and a warning on the IC). I can't think of a good way to check that kind of intermittent other than(possibly) long-term monitoring. While you're in it, take the battery to a shop for a load-test. Z | ||
| Bextreme04 |
I just replaced the battery when this first started. It was the original battery that came from the factory and was 3 years old. I have the FH0012 regulator not the original Ducati one because the original one had that intermittent high voltage issue. With the harness disconnected from the stator plug it reads ~ 20VAC at idle and ~ 50VAC at 5000 rpm.. With everything connected and back probing the same connector I get 6VAC on two legs and 9VAC on one at all RPM's. I also checked resistance again just to be sure and I have 0.0ohms between all three legs and to ground. | ||
| Baf |
0 ohms to ground... is that with the stator connected to the VR? You should be doing that check without the VR hooked up. Your stator sounds fine, but your ground check results are puzzling. | ||
| Reepicheep |
A short to ground could do what you describe... for a while... then it finish melting things and you will have low output voltage. Seems really odd that it would be all three legs at 0 ohms though. Was the meter on the 10 ohm range? | ||
| Bextreme04 |
Yeah... very puzzling. I finally just decided screw it. I'm pulling the stator tonight and sending it off for a rewind tomorrow and i'll install the EBR rotor while i'm at it. I was planning on doing it anyways when i did the 12,000 mile service so it looks like it is just gonna get done a little bit early. |
