IF you've had intermittent working of the lights in the past and now they work for a second or so, I doubt if it's the fuse - once blown it never works again. You've probably got a bad connection, just like several posts above are suggesting. You're going to have to trace out every wire and confirm each connection. It's not fun and it usually isn't quick, but there's probably no other path to follow. Do you know how to use an ohm-meter?