Hello *******, O.k. power at the fuse, but on both sides of the fuse? I had a recent issue also, the 'LOAD side' was crappy and corroded. Also sometimes a lot of connections are made up in the bucket, where the headlight is, might just be that the 'HOT' wire goes there to feed circuits, comes out to headlight dimmer sw. then back to headlight, also there is usually some sort of bonding jumper cause the forks move, the jumper makes sure a ground is there for front dir. sigs, and the headlight. . .Had a Clymers shop manual years ago, good book to have.
If you don't have it, a multi-meter, get one, It does not have to be real expensive, enough to measure 15 volts d.c. with and an ohm-meter is with it.
If you can't swing a meter at present, try the auto parts stores, and get a socket for a tail-lite bulb, add longer wires and put a gator clip on one wire, clip to a good ground and with other wire check for voltage, not the greatest but u will know where there is voltage/power.