LOL rob thats awesome. some of my puch tail light bulbs end up that way sometimes, but never on such an epic scale.
did you try 12v bulbs? are they blowing on you too?
zener diode is worthless. the whole point of a hardwire is to chase out areas where electrical ghosts hide.
a zener diode is really a regulator, i mean it is but not really.
its allows current to flow in both directions, which is kinda retarded to begin with, a moped shouldnt be wired that ass backwards, but you know how mobys are, all the juice goes to the front before it goes to the back. the zener makes it so it can all be on the same block, hence the reason so many fucking mobys have electrical problems.
its not the diodes fault, but shit just shouldnt be wired that way to begin with