Power interface kit for connecting a third brake light.This kit is inserted between the connectors of a Position/Stop light.It absolutely requires connection to the 12V service battery, for this you will have to pull a cable which must be protected by a sheath and a 1A fuse, and connect it to the 12V battery.This kit being specific, it is not necessary to connect the masses of the two wire outputs . You must connect your third brake light directly to the indicated outlet.