Use a plug and play loom, much easier, the good ones use 6mm/50 amp wire with proper connectors and good quality 30A relays.
http://www.brightlightautoparts.com/DrivingLights.html
scroll to the bottom of the page, P/N HT2030
or pirhanha do a loom too.
The switching wire plugs in between the std loom and the back of the headlight. Mount the relay on the firewall or inner guard, connect the power to battery and the earth, and you're done.