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Buell Forum » 1125R Superbike Board » Stator/Voltage Regulator/Charging System subforum » How do you check the voltage regulator « Previous Next »

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Craigsmoney
Posted on Sunday, July 28, 2013 - 12:48 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Oh boy, exerciser in frustration this machine is. (09 CR)

I was riding the bike the other day and notice that the volts (I watch them religiously)were low (12.9-13.5) with the high beam on. If I turned the high beam off, it would migrate between 13.1 and 13.8. (harness plugged in at highway speeds around 4-5000prm)

When I get home I do all the stator checks. Resistance checks pass (all 3 legs to engine case, and then 1-2,2-3,1-3). I do my ac output test, and it tests at 38vac at 3000rpm warm, and 40vac cold.

For 09 models that is a little low, but from the research I did, it is with range for 08 models, so it should still give me 14.1 volts. I can't get over 13.5 (I get an ocassional jump to 13.7).

Here is a weird one for you. With the charging system "fix" bypassed, the bike will charge 13.9-14.1V at idle, but as soon as you bring the rpm's up , the charge drops. The higher the rpm, the lower the output.

I do have the rotor upgrade (installed over the winter months), and at the end of last season I got a new stator, charging harness and relay and Voltage regulator. (under factory warranty). I can't have more then 1500kms on this set up.

I have done tests with the harness plugged in , and removed. Same results.

So the only thing I can't seem to find in the manual is how to test the voltage regulator.

Any help would be greatly appreciated.

Thanks

Craig
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Shawns
Posted on Sunday, July 28, 2013 - 01:08 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Here is a link to some helpful videos. http://www.roadstercycle.com/Roadstercycle.com%20V ideos.htm
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Craigsmoney
Posted on Sunday, July 28, 2013 - 01:41 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Thanks for the link Shawns. I followed the advice in the 8th video, and the regulator passes when it is cold. I should probably heat it up and try it again.


So why would i get 14.1 volts at idle, but less at higher rpm?
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Shawns
Posted on Sunday, July 28, 2013 - 02:29 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I f I remember correctly the voltage for charging fluctuates depending on the status of voltage at the battery. Mine usually fluctuates between 12.8 and 13.8
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Civi
Posted on Monday, May 26, 2014 - 12:20 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

@craigsmoney, it is important to note here that your battery will charge if the voltage being supplied to it is above 12V, so no worries about that. Now coming to the issue that youíre facing, itís related to a voltage drop of >0.5V which is very less and most people ignore it all together. When your bike is running, it gives you the correct AC voltage, there can be a small leak in the rectifier circuitry which could be responsible for this voltage drop but overall, itís not a very big issue that you need to be concerned about.
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