Both Sim and Dave are correct about the MMM module,, the modification has been done by many people and then the bike ridden for years and many thousands of miles covered with no ill effects.
I have never needed to do this MOD on any of my VZ`s so I must be lucky but have done it for other people,,,, whilst you are delving into the wireing to do this Mod check all the wiring blocks and terminals in this area ( starter relay etc.) as bad connections can cause this fault and VZ`s are known for this,, and make sure your battery is in good condition and fully charged,,, the only time I thought I might need to do the MMM module by-pass turned out to be a failing 10 month old battery.
A quick way to check:-
A 12 volt battery fully charged and in good condition should read about 12.2 to 12.6 volts with no load ( i.e. nothing turned on).
Turn the ignition key on, but don't try to start engine, the voltage should be about the same 12.2 ish volts, if sharp drop is seen when key is turned suspect duff battery or needs charging.
Good luck mate.