The usual suspect for a short is the wiring harness.
I know that should really narrow it down for you.
Look at any location that passes over a corner/edge or between 2 parts.
1 place in particular is the headlight shell where the wires go thru the opening.
These are usually a short between 2 wires in the bundle.
If you really want to find it fast, then replace the fuse with a solid wire then look for melting wire, smoke or fire.