Alternator Electrical Query

[barrymurphy]

Because there's a parallel path through the field coils in the rotor.
I would expect that removing the regulator pack would also remove this parallel path, but that may not be the case for this particular alternator.
The absolute best you can do without disconnecting at least one end of individual diodes, is to test the nine diodes in batches of three, since each group of three are physically connected together at one end, and connected together through the stator windings at the other end.

thank you