Here's a pretty good diagram of the wiring circuit with the headlight switch on the far right, and the fuse panel on the lower right with the red wire from the battery feeding the orange wire.
This one shows the fuse panel to the left of the headlight switch bottom center, without the arrows. You can follow the blue wire from the headlight switch to the dimmer switch.
If you save them to your hard drive you should be able to enlarge them for a better view.