Alek - I got your question now...
The wiring at the top of the page is the power source for the headlight, it runs through the right side control. The control for the dimmer (hi/lo) is on the left side switch, and shown at the bottom. Make sense?
The tiny speaker you describe is the turn signal buzzer. If your bike has the stock front brake switch, it's round, has two male bullet ends, and should be around the bottom triple tree, slightly behind it and the steering stem.
The coils hang horizontally in the open space of the backbone below the tank. I don't use a stock switch else I'd snap a picture for you.
However, here's a fantastic thread for you to read and refer to for premium quality guidance and pictures of a stock 550
http://forums.sohc4.net/index.php?topic=86697.0