ducatipaso.org

Basically it's like this: Most regulator rectifiers, including Ducati's, are SCR type units. SCR stands for Silicon Controlled Rectifiers, i.e. the type
(composition) of the rectifier components incorporated into the unit's circuit board. While SCR's do the job, some time ago the electronics genies
discovered/developed what is called "mosfet" transistors (Metal-Oxide-Semiconductor Field-Effect Transistor). I became aware of them through their use in audio and power amp circuits. These little marvels are increasingly being used in all sorts of circuitry as they are more efficient, have less resistance, when they shut down they do so completely not holding residual charge etc. Simply put they're more robust so when I discovered that a Japanese manufacturer had developed a mosfet reg/rec unit I investigated further. And as you will see if you check some of the links below people have been upgrading several different brands of bikes with mosfet units and getting good results.

It's important to note here that, given the obvious need to charge the battery, the stator wires will have to pass 29 amps (350 watts/12 volts) continuously.

So to upgrade the regulator rectifier on 748' from 1995–1998 you'll need:

Shindengen FH012AA
Replacement wiring (see Shazaam's post for recommendations) :
Furukawa connectors x 2
Heat shrink
30amp blade fuse
Suitable blade fuse holder (preferably good quality and water proof) frequently recommended is the Metri-Pack Fuse holder