when I installed my horn, I just pluged the same wires in , try it both ways , pos, and neg, one way works better,. for the HID head lights I ran wires from the battery, just wiggle the wires thru, from the seat on the right side ,used a coat hanger to fish them thru, put a fuse on the wire near the battery, pos. wire, good idea pull wires thru 1/2 " I D tubing for protection , vibration will eat thru wire cover in a year or two,.