Ok so actually there's no diodes in the RR
It uses the 2 highs of the wave to get some flat line that's like DC not such a true DC then
Yes single wire to 2 pin plug is the very low voltage 1v at most and tests fine - that's the trigger wire to CDI Blue with white
High voltage AC line not connected cause that's the AC CDI feed and not needed in this case as its s DC CDI