I'm not 100% on this, so this is merely "cautionary": The two smaller white wires may be either for the field on the alternator or the instrument idiot light. If for field then you could possibly be discharging your battery whenever the VX isn't running, meaning a stone dead battery if left to sit long enough. If for the idiot light then it would either never illuminate if there was an alternator failure or stay constantly illuminated. Plus you could be introducing some nastly line noise into the electrical system as well since the alternator produces AC which is rectified to DC by that little teeny-tiny voltage regulator.

If I have time this evening I'll check the factory wiring schematic on the VX and the type of alternator we have. Unfortunately I just don't remember much about it since fiddling with the GM upgrade a couple years ago.