There is a white wire on the light and thats the power supply. Most have a colored stripe in red. We are not sure why your power the light with a second switch when it has a power source and an output post that will power another light from the pivot switch. The switches are easy with a roller contact and these do corrode, requiring brushing and lubrication.Last edited by Bass Cat Boats on September 10th, 2016, 12:51 am, edited 1 time in total.