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rickals wrote:
I have a good battery and a new alternater, at and above 1000 rpm i have 13 to 14v. at idle about 850 to 900 rpm i have 12.5v. The dealer says thats normal for the 1500, seems funny to me!
That's exactly the same results my stock alternator did. Perfectly normal. I now have a Compufire alternator fitted and if you drop the idle down to 750 rpm or less then that will also cease charging. Crank it up to 850 rpm or more and it's charging good again. Every alternator has a charging/rpm cut off point, three guesses what our alternators are? ;)

Regards, Tony.
 

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DriverRider wrote:
Waldorf wrote
That's exactly the same results my stock alternator did. Perfectly normal. I now have a Compufire alternator fitted and if you drop the idle down to 750 rpm or less then that will also cease charging. Crank it up to 850 rpm or more and it's charging good again. Every alternator has a charging/rpm cut off point, three guesses what our alternators are? ;)

Regards, Tony.
Curious if you have owned the bike since new and it was showing this behavior. At what mileage was it replaced? Did not the dealer replace it under warranty.

JD

No dealer was involved in any way. No dealerships or any other mechanics work on my vehicles. I do all my own work from the smallest of tasks to full structural work & painting toanything else in between. My day job is electronics & mechanical engineering. I simply replaced the alternator for the Compufireas Irequiredthe greater available output it could provide. The OEM alternator was working just fine when I removed it. I still have it boxed up just incase I need it again. Your alternator may simply have a cut in output speed just below your current idle speed in which case you are very lucky indeed. It's all to do with the voltage regulator charecteristics and ambient & opertaing temperatures that the alternator operates in. In my case, when the temperature is quite low, just below 800 rpm thealternator cuts in. When in Europe in the heat, the alternator cut in just above 850 rpm. The output of the Compufire is alsotemperature compensated so the hotter the alternator the lower the available output, the lower the temperature the higher the output "depending on the load required". Another variable is the rpm indicator gauge. These differences are onlyplus or minus 100 rpm, so is the voltage regulator perfect? is the bikes rev counter 100% accurate? are the ambient temperatures the same? These are all small variables in the grand scheme of things.

You are fortunate that your bike is charging at idle, on the other hand some of us are less fortunate. But overall we are having a great time and all is well with the World.

;)

Regards, Tony.

Regards, Tony.
 
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