79 cb650, new rotor and new battery. R/R that was on the bike went bad as 1 of the stator brushes wore down causing intermittent charging and a very dim headlight on the night drive home from work. Changed stator from parts bike, it had good long brushes. I tried the r/r back on for testing battery volts and it went up over 15 volts at 4000 rpm and got quite hot to the touch. Tried my spare from parts bike and it leveled out at 14.70/71 volts and back down to 14.68/69 volts@4000 rpm, plus this one got hot to the touch as well. So both r/r's are toasted; what i was wondering was i picked up a Motorcraft ford regulator off a 70's series 3/4 ton from junkyard for $5. Can i wire up this regulator and it work with one of the cb650 r/r units i have by just using the rectifier side of the 650 r/r box? Don't know if it has been tried but if i get rising volts then the rectifier side must be converting and regulator side is going to crap out. This make sense to anyone?
This is probably the wrong thread for this. But, the heating R/R can be caused by external factors, like the rotor drawing too much power through the R/R. This is actually quite common with the CB650, and gone to extreme can damage the R/R unit.
I recommend you measure the resistance of the rotor. If below 4Ω, you found the cause of R/R heating and destruction. The lower the resistance the higher its current and power demands.
From your readings, it appears you already have working R/Rs. They are likely being taxed by a defective rotor.
BTW, the "stator" refers to the stationary alternator windings, and the "rotor" refers to the rotating windings of the 650 alternator type. Your post cinfuses some of the terms, which may add to confusion.
The stator does not have brushes, the rotor does. What was it you replaced? Have you measured the rotor resistance?
