Do a search on it.. there is a thread in here somewhere on it.. just cant find it now... but you pull the driver side fuse panel lid off (between door and dash) then pop off the headlight, 4x4 bezel... unplug the 3 plugs... then you can take the headlight switch apart and there is a small spring inside that you remove..
the spring is what keeps the dial from staying in the OFF position and springs it back to auto... by removing the spring, you are now able to keep the dial in the OFF position, killing the DRLs