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The internal battery in your multimeter! Touching the wires together should give a reading of 0 Zero, whatever scale it is set to for Ohms. Any reading other than Zero with the leads shorted points to a low battery, no point testing anything if the meter is not reading correctly!
I recently sent 3 RR24 reg/rec's back to M&P's all of them not working correctly, got a refund in the end, i then got a UK made RR24 from elcterexworld, more expensive but worked correctly from the moment i fitted it, seems there is a dodgy batch at M&P and they are happy to keep selling them, when i get things like this i only cut the corners off of the bags they are in just enough to get the plugs out, i then test run them, the reg/rec's never leave the bag until i am sure they are good.
You can, test the 3 coming out of the stator like that, and the voltage coming out is the same plus or minus a volt or two, just make sure your rotor is powered up as well.
No you will need to put battery positive voltage to rhe white wire and earth the green one to power the field coil then with engine running you should get AC across each of the 3 pairs of yellow wires
With the bike running put the multimeter across the battery terminals (set to the 20v range), rev the bike up to 3k revs and you should get approx 14.2v, if you don’t it’s your alternator or associated wiring, if you do get 14.2 then it’s the battery that’s not holding it’s charge, if you get more than 14.2(ish) then it’s the reg rec,