reg/rectifier check

davew · Dec 16, 2009

hi
does anyone know if the 3 phase reg/rectifier needs a load on to show any voltage on the output.have got a 2003 fs650 with battery and starter removed.im trying to get the lights working and have the following voltages
stator yellow /blue 15 volts idlig rising with revs
red out of rec/reg 0.6 volts at idling and with revs
some where in one of the other threads it says i need a load but an auto electrician friend says i dont.not bothered about buying new one as long as i know its faulty
thanks

ned37 · Dec 16, 2009

fwiw, the 15v you are seeing is ac, and the output of the r/r is dc. reading it on ac will provide a very low reading.

davew · Dec 16, 2009

hi ned
yea have changed the meter over when doing checks.thanks

Komatias · Dec 17, 2009

I found the same, you need a load on there to get a voltage reading that makes sense. I was finding that the open circuit voltage was decreasing with revs.

davew · Dec 17, 2009

when you say load will the lights be enough as thats all ive got with the battery and starter removed

Faust · Dec 17, 2009

lights are a good load.a battery is not much load but is good for stable output.and starter is not a load(unless you push the button and even if you had it you wouldn't be using it during your rectifier test I suppose).if you don't have a battery you get kinda unstable output at idle.turn on your lights and measure the output of your reg.

reg/rectifier check

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