My stock Nissan h3 fog bulb blew so I replaced both with piaa's and also performed the foglight rewire mod in the relay box. All was well for about 3 weeks when suddenly the fuse blew. Now as soon as I replace the fuse and kick on the lights it blows again. Very frustrating. Any ideas? I had no luck with the search.

 

Check to see if the bulb is shortening to ground. What I mean by this is, see if the bulb is "sitting" flush within the socket making contact with the contacts. If not, it will keep on blowing fuses. Also, check if any connections is touching any metal.