RUN DON'T WALK - Replace your regulator brown connector NOW.
THIS IS THE PROBLEM with just about every single Aprila Mille that has problems charging, starting, dash resetting etc. etc. Here is my thread explaining the process as I soldered mine straight and it's works like new now!
http://www.fourwheelforum.com/showthread.php?t=245
I still haven't put the Yamaha solenoid in but I will be doing that in the near future when I have time. I've been full speed ahead working on my V8 engine swap into my Toyota Tacoma.