2012 GMC Sierra SLE: Auxillary roof mounted lamp

2012 GMC Sierra SLE: Auxillary roof mounted lamp I have the plow package on this truck, with a switch on the upper control console. I found the two wires to connect to my led lights on my back rack, but cannot understand why I don't have any power going to the wires?? is there something that i have to connect under the hood to achieve power to my lights?