[ERASER5]

That site has some very good information. He does however overly complicate things a bit. That is not really a bad thing, but it does confuse the electrically challenged.

Only one relay will be pulling current at a time, so only one power source and fuse is needed. Do not use a fuse. Use a breaker. Re-wiring the headlamp is only necessary if you are going to use very powerful lamps like HIDs. Hologen and H4 bulbs will be fine with the factory wire.