Diagram should look like this:
----------------
| |
B --- F ---- R--------L-----G
| | |
------------- S---------------
Switch has 3 connections
Batt source - so relay knows singal is hot
Ground - ground

Acc source - sends signal to relay to trigger lights
Fuse
Sits within 12" from Battery
Relay
Battery source (from fuse) - actual power to lights
Switch source - receives signal to trigger lights on
Ground source - ground
Light source - sends power to lights when switch is triggered
Light
receives power from relay.
ground
It's something like this. But don't worry about it as your wiring harness will take care of this. (The harness will come with everything you need so you don't need to buy a fuse or wire clips). All you have to do is plug and play!! It'll have all the pictures on where what goes and you'll figure it out quickly that it only works one way. The only thing you need to do is crimp the lines so you can attach it to the relay and switch. Also connect it to the light and battery too.
Make sure you use your switch instead of theirs. Also you have to decide if you want the lights to be activated via by headlights or direct. This means you can use em whenever or when the headlights are on.
Tool(s) you will need:
Wire crimper (radio shack)
Beer
Someone that can read instructions cuz I never do
