All I did was tap into the high beam wire going to one of my head lights and used a $20 relay that is typically used for fog lights and come in a kit with a switch. The high beam wire only feeds the relay so it draws next to nothing for the line. I installed the switch in the cab so that I can turn off the feature if I want. I have also done the same switching set up for the off road lights that I have on the bull bar also with the switch in the cab. Now when I put on my high beams I get the fogs and off road lights automaticlly the the switching of the stock high beams. There's not much that I don't see at night with this set up. If i'm in a high trafic area and am concerned about being to bright to the wrong car that comes over a hill unexpectedly (cops) then I can turn off the fog or off road or both with the switches that I put in the cab and funtion like a stock truck.