revving lowers battery voltage

hacky · Post by **hacky** » Tue Dec 01, 2009 12:04 am

I have the RR26 from electrexworld and their stator. Since I inserted these something strange happens:

How can it happen that when I rev up, the voltage goes down? I insert a fully loaded new battery. At 1000 RPM the battery gives a steady 12 volts and when I take it for a spin I can see all control light dim when I rev up above 5000 RPM. The front light goes off when I do this long enough and after some more time even the CDI shuts down and halts the complete bike. Then wen I rev it down below 6000 RPM or so it comes back to life. I'd say the reg/rec is attached the wrong way, but I looked a dozen times to check it. I should check the output voltage of this. Maybe it's too high or even negative, but I don't feel like taking off the tank...

maybe it's a common problem anyone can point out?

smithyrc30 · Post by **smithyrc30** » Tue Dec 01, 2009 5:00 am

You did connect the battery the right way around???

The earth from the battery is connected and good?

Seriously though it sounds like there is something wrong with either the generator or the reg.

Disconnect the white/red wire from the battery (there is a handy joint just off the battery or undo the lead. Fir the bike up (it will run without the battery and measure the voltage from the white/red wire and the chassis.

This should be around 10~12volts at 1000rpm, going up to around 14 volts when you rev it.

If this checks out ok and you did have the battery the right way around, take the left side panel off. In the fuse box there is a fuse which goes to the battery (20A). There is another, can't remember the size but it has a brown and white wire going to it. This comes from the regulator. Measure the voltage here this should be 10~12.5 volts maximum. Any less and either the regulator or the generator is broken.

Then you will have to remove the tank

hacky · Post by **hacky** » Tue Dec 01, 2009 2:02 pm

cthanks. That sounds like a good way to find the cause. The battery is connected perfectly, so I can amost conclude that the regulator or the generator. damn! I keep buying new ones of these.

Cexley · Post by **Cexley** » Sat Dec 05, 2009 3:02 pm

I have a similar problem. Put new battery in and meter shows a constant 12-14v whether the bike is revved or not. I did the trick above and disconnected the battery and ran up the engine and it showed a constant 4v.... The previous battery had very little electrolyte in. I topped it back up and it seems fine. I have only had the bike a month (doing top end rebuild) but as it won't rev, I suspect something (or everything!) has been fried. Has generator and/or regulator packed up. Any ideas?

hacky · Post by **hacky** » Sat Dec 05, 2009 10:24 pm

what showed a constant 4volts? The output of the regulator? damn, that must be bad.

Damn..I don't want to spend a bunch of money on a regulator and generator...again...

Cexley · Post by **Cexley** » Sat Dec 05, 2009 11:06 pm

Checked the fuse holder and found the white wire that connects to a 20amp fuse and the red/white wire that goes to the battery quite corroded. Cleaned up the connections and now getting correct charge readings. Maybe you have a similar problem. I also check and cleaned the 2 main earths. The one form from the battery and the one by the regulator.