over charging! do i need a regulator?

[Davy]

Hello again!
I have just fitted a new (second hand) r/r. Was getting 15v across battery terminals at idle which seems a little high though better than before when I was getting 16.8v. Took it for a very short spin, when I got back I was getting 15.5v across terminal at idle, the r/r was very hot and the alternator stator casing seems very hot. could there be a fault with the stator or the wiring to the stator which is cooking my r/r?

[Nessism]

Davy,

Did you rewire the charging system to bypass the factory wiring like Steve suggested (two times)? If not, please do so. Stator must route straight into R/R, not into the factory harness.

Running the power out from the R/R though a fuse and straight to the battery is good.

Running the R/R ground to the battery directly is good too, but you can also attach it to a solid frame point, as long as the metal cleaned down to raw steel.

If you wire the system like described the bike should charge at 15 volts or a little less at 5000 rpm. If your bike is charging higher than that, most likely the R/R is bad.

Good luck

[Davy]

Hello,
Yes I rewired it to bypass the factory wiring, the 3 wires from the alternator stator go straight to the r/r, the red wire and black wire from r/r go straight to the battery.

It may need a new r/r but it seems a little odd. When I got the bike it had a replacement aftermarket r/r. I have bought 2 more. This last one seemed to work at first but is now showing 15.5v across battery terminals at idle, once I switch the bike off I can hear the battery fizzing. So the bike has gone through at least 4 r/rs. It seems like there must be a fault somewhere blowing up these r/rs?

Any suggestions greatly appreciated, I am starting to lose patience !

[posplayr]

What r/r are you using? Is it a 6 wire? Generally there is not sufficet voltage coming out of the stator at idle to even deliver 15v at the battery. Have you done a quick test to get a frame of reference?

[1_v8_merc]

My 650 experiences 15+v spikes randomly. If I tap the brake pedal it goes away. I used the 7-wire R/R from a Honda Goldwing. I read on another forum that they were prone to overcharging on bikes other than Goldwings. Something to do with honda's electric fans or higher electrical demand? Have no idea if it's true or not.