Hey Here is another TIP. This $10 wire kit from Auxbeam is awesome. You have way more then $10 in just wire in this kit. It makes hooking up the light bar a 4 wire install
Red= goes to cars 10amp Key power
Black= Ground.
Black= light bar ground
White= Light bar power.
It come with a small dash mounted On Off switch that you can attach to your dash to turn the light bar on or off OR you can cut the switch off and attach it to the Floor mounted on off switch that I use.
Here is a link to the wire kit
And here is a pic of the Floor mounted on off switches I use
The white plastic is a spacer I make so that it mounts on the back side of the floor pan