Many thanks for the detail reply Simon and co, I've been away a while and I'm just getting back into it.
The enclosed pic is my multimeter set for continuity, I have 3 rectifiers and Ive tested them all (on the bench) I have no continuity between the 3 yellow (inputs) and the red/white outputs on any of them. Does the bike need to be running and all connections made ?
I've set the meter for resistance on the smallest scale (200) and tested the green and white field coils (again I have 3 units) and they all test (on the bench) at 4.6
The stator AC output I'll look at tomorrow.
I apologise in advance, I think I understand the theory but maybe I'm not testing right
I'm not sure if everything needs to be connected and running