Blown fuse suggests that +'ve is grounding in line with the main fuse. I don't think that the stator is in line with the main fuse. The reg/rec is in between. Would be catastrophic for the reg/rec if the stator was shorting.
It's worth checking. Don't even need to take the stator cover off. Unplug the stator from the reg/rec and measure resistance of each three phases on the stator to the chassis. Resistance should be very high (infinite even). If it's low, on any phase, then the stator is toast.
Additionally, the resistance between all three phases measures to another phase, should be low, circa 0.2 ohm. I.e call the phases A, B and C. A->B, A->C and B->C should all be very similar and around 0.2 ohms.