Charging system problem

Using a multi meter choose continuity on the dial. (Also make sure it is set to beep when showing continuity fault for easy diagnosis)
Remove the regulator rectifier connector plug located at the front of the primary cover.
Insert the positive multi meter test probe into either of the female stator pins and put the negative multi meter probe to ground. If the multi meter beeps when the positive lead is inserted into either of the stator pins then your stator has shorted to ground through its failed stator windings, if the continuity test shows no shorts to ground then the connection pins may be the problem!!

If the male pins on the reg rectifier are a darkened and glassy or glazed this indicates a connection failure between the male reg rectifier pins and the female stator pins causing heat build up and eventually causes your pins to slowly lose their connection which in turn causes the reg to over work n slowly fail.

If this is the case when a new reg rectifier is fitted pry open the male connector pins slightly for a stronger connection also ensuring you lube up the connector pins with electrical contact grease. Thus giving you longer running life of your reg rectifier. In the case where you don't want want it to fail again due to poor connection or old age remove the primary case cut the plugs off of the reg rectifier and stator run same gauge two core wire and hard wire the rectifier to the stator using the old stator connector grommet on the primary case cover to run your wires through. Ensure you use heat shrink over the soldered sections of each wire instead of electrical tape to prevent any possible chance of failure. This rookie mistake can be made by the best of technicians. Hope this helps

Mattica,

it is very important to check and verify the AC voltage from the stator output. I don't know what your specific spec is off-hand. you can do this with a multi-meter at the ouput plug from the stator where it connects to the voltage regulator. A BAD stator will ruin a new voltage regulator until it is replaced. I just went through the same exact thing.

Sounds like the stator may be grounded