A suggestion that I have about the stock foglamps is to not run them all the time. Meaning, don't run them when your lights are on. The main reason for this is the multifunction switch was not made to handle the continual load of all the lights (low beam + fog lamps) and thus the switch has the tendancy to fail. There are a couple things that you can do to remedy this situation. Most involve rewiring of some sort for the fog lamps. I would suggest the use of a relay to provide power to the lamps. Of course, this involves some work and some $$, but in the long run, you will be happier for it. Besides, the stock foglamps are for show only as they are entirely too dim (low wattage) to provide any increase in visibility. With the relay you can get higher wattage bulbs for added visibility.
Here's one way to rewire your foglamps for circuit protection.