Side lights come on but headlights are intermittent (full beam is ok too).

This seems to be independent of driving over any bumps, and does not seem to be the internal switch either.

I am thinking it is a loose fuse. Can someone please tell me where the correct fusebox is (a previous car of mine had 2 separate fuseboxes in engine bay and under the dashboard) and tell me if i will be looking for a 5v or 12v or whatever?

A diagram or description of which exact fuse it is would be even better!

Edited 9 December, 200916 yr by branney

What car is it?

If it's a Felicia, then the fusebox is under the passenger side of the dashboard, retained with a thumbscrew and then it hinges down. Not sure what fuse does it, but to test your theory, you could wiggle each fuse, won't take long.