Allen
I do not know the specs for the resistance of the stator coil, but I can tell you that the factory measurement for the voltage output (at least on my ST4s) is to be checked with no load, i.e. right at the stator wires. It is AC at that point because the current has not been through the rectifier/regulator, and since there is no load on the output it should be much higher than the nominal 12-14 volts. More like 30AC volts, IIRC. If you measured 12 volts with no load, then you certainly have a defective alternator, which means almost certainly a bad stator. It could be a bad magnet on the rotor, but that would be very rare.
Hopefully, someone with a ST2 service manual will look up the resistance for you.
I actually have the opposite problem. I replaced the Ducati R/R with a Suzuki unit and I now have voltages approaching 15 at the battery! Certainly not a problem I was ever expecting on a Ducati haha.
Keep us informed - I think that if the electrical gremlins are attacking your bike, they will probably leave mine alone.
Sandy
Sandy, I have tested the stator and there seems to be continuity between the two yellow wires and not between the wires and the stator frame. I can't seem to find out the correct resistance figure for between the two yellow wires, do you (or anyone else for that matter) have any idea what it should be?
Oh, and I did measure the output voltage before getting started, I can't remember the exact figure but it was well below what it should be, just under 12 volts I think. There is a dry cell battery fitted and I don't know if that affects the voltage shown in the test though?
Hoping to get back on the road before winter!
Cheers,
Allen
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