Charging question

[Gary pope]

I recently had an issue with my 94 xp with the 657x motor in her. When I got it home I started it and it ran for a minute or so and then just died. Upon trying to restart it it would turn over super slow with only 6 -7 volts coming from the battery, a new battery at that. So I pulled the motor and got to tearing apart the stator cover and low and behold the stator was completely fried.. I installed a different used stator, put the motor back in and started it up... it starts good and seems to run good on the trailer... but I notice when I hook up my multimeter to it the volts jump all over the place while it’s running...when I shut it down it goes back to the 12.79 volts..what could be going on here. Can my rectifier be fried to!

 

[Ckrawiec]

Yes, rectifier is suspect....you should have 14.4 to 14.6 vdc on battery while running, voltage would be coming from .the rectifier/regulator. Your stator puts out AC current

 

[Sportster-2001-951C-Stock]

Sounds like a bad rectifier to me as well.

 

[Gary pope]

Hmmm...ok...looks like I’ll swsp out the rectifier tomorrow then and go from there..

 

[Ckrawiec]

Here’s the rub on rectifiers though....I’m on my third and still having intermittent issues....sometimes I get a nice 14.4 on the battery, sometimes it’s erratic like you described originally.....I haven’t found the holy grail rectifier yet....hope you have better luck than I

 

[mikidymac]

Standard on the rectifier is high 13 volts typically 13.5.

 

[Ckrawiec]

Standard on the rectifier is high 13 volts typically 13.5.

NO arguments here..I went by what I read in 2 different service manuals.....

Directly lifted from a 1993 & a 1996 service manual -> 587 / 717 engines , regulator output 14.5 to 14.8 volts, 787 engines, regulator puts out 14.5 to 14.8...ANYTHING over 15V...rectifier/regulator is bad [paraphrased]. A faulty regulator will allow voltage to exceed 15V as engine speed is increased.

I'm wishing is could get a steady 13.5 reliably...not there yet on my '96 but I'm still trying

 

[mikidymac]

You should be good to go. I just haven’t had them that high.