stator test B2: 0-100 Ohms

[Guest]

If I get 85 volts out of the stator at step three of Test Phase B, why is it bad according to the fault finding chart at the second step of Test Phase B, "any reading between 100 Ohms and zero Ohms" ?

I changed my starter clutch successfully and now I am questioning my stator.

Should I open it up and look for pinched wires or something?
Thanks,
-Bob

[BassCliff]

Hi,

There's a difference between volts and ohms. 'Ohms' is a measure of resistance. 'Volts' is a measure of potential, or electrical force.

Any reading of continuity (a connection with very little resistance) between a stator leg and chassis ground would be fatal for the charging system. That would mean a short between one leg of the stator and ground. The stator would not charge properly.

I've had stators pass the "passive" tests (checking for resistance between the legs or between a leg and ground) but still fail the "active" test (AC output at 4000 rpm).


Thank you for your indulgence,

BassCliff

[littleroot]

Hi,

There's a difference between volts and ohms. 'Ohms' is a measure of resistance. 'Volts' is a measure of potential, or electrical force.

Any reading of continuity (a connection with very little resistance) between a stator leg and chassis ground would be fatal for the charging system. That would mean a short between one leg of the stator and ground. The stator would not charge properly.

I've had stators pass the "passive" tests (checking for resistance between the legs or between a leg and ground) but still fail the "active" test (AC output at 4000 rpm).


Thank you for your indulgence,

BassCliff

Good info. I am learning.

And I got real lucky, apparently: I found the pinched wire, taped it up and the system appears to be working now as I get over 14 volts across the battery now at high revs. Phew!

[Matchless]

Actually 0-100 ohms is a bit misleading and what is actually meant is that there should be no resistance reading, meaning there is no direct or resistive short to ground when testing with a multimeter.

In actual fact this measurement is usually done with a proper insulation tester that uses a high AC voltage of about 500v or 1000V between the ground and the windings and usually a reading of about 20 mega ohms and higher to infinity shows insulation that is not breaking down. Lower than 2 mega ohms could be an indication of something wrong, referred to as leakage to ground.

[davidduarte]

you may want to do yourself a favor and replace the stator and the regulator/rectifier. The GS bikes are notorious for this sort of problem. From my (limited) understanding, if the stator is bad, it can cause the r/r to go bad, and if the r/r goes bad, it can fry the stator. Check out http://www.electrosport.com/ (used to be Electrex USA). They sell replacement stators and r/r's that are better than stock. I replaced both on the 81 850G I used to have, and the r/r on the 80 450 I have now. Never had a charging problem ever after that.