Have you checked between the three yellow wires and a known earth at 2000 revs ( meter set on AC and the plug unplugged ) ?
Well good news is you have now found the fault..
The bad news is two fold
1) You need a new genny
2) You shoulda taken note of my post on the 4th !! 8rfl@
Basically yes, there is a leak to earth somewhere.. It is usually a breakdown of the insulation lacquer in one of the coils :xm
This is far from a rare fault.. It is in fact the second most common.
You can check all sorts but the chances of it being anything but the genny is pretty remote
Errr.. re-reading your post..
You did do the test with the plug unplugged didn't you ?
Yeah I know, head in the clouds!!
Genny - as opposed to the stator, you mean the spinny thing?
I've fitted a new stator.
Well I'll remove the stator and check, have fitted half a dozen and pretty sure I fitted it neatly, but don't discount it obviously.
The static test didn't show any continuity between the connector block and earth but I guess that is a very small amount of volts trying to make the jump.
What about connecting my old 12v battery (replaced as didn't have enough umph - technical term) to a pin on the connector block and then a volt meter between the other pole and earth? If the stator is insulated you won't have a circuit, but if broken then should show some reading. I also have soldered a couple of wires to a 1.7w 12v dash bulb to test for presence of volts as sometimes a specific reading is not required.