Make sure on the proper size fuse, don't go and put a bigger fuse in there if it is not called for. I seen a car recently that the lights went out on it, so the guy just put a bigger fuse in it and melted the entire wiring harness under the dash of the car. The source of the problem was that his license plate light was grounding out.
I would start checking as much of the wiring leading up to the fog lights as you can, inspect it for any kind of missing plastic covering that would allow a wire to ground out. Oh and another thing, be careful, the fuse blew for a reason.
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